Hagia Sophia's Christian History

1. What Hagia Sophia Is

Hagia Sophia is a domed building in the old city of Istanbul, on the promontory above the Bosphorus where the Byzantine imperial palace and hippodrome once stood. Christians built it, Christians worshipped in it for about nine hundred years, and its surviving decoration is Christian art of the first rank. The Greek name Hagia Sophia means Holy Wisdom, and the dedication is to Christ as the Wisdom of God rather than to any saint called Sophia. Byzantines mostly called it the Great Church.

The dedication matters, because it explains the building. St Paul calls Christ "the power of God and the wisdom of God" (1 Corinthians 1:24), and the Wisdom literature of the Old Testament, above all Proverbs 8, was read by the Fathers as speaking of the eternal Word through whom all things were made. A church dedicated to Holy Wisdom is a church dedicated to the Son. Byzantine dedications of this kind became common across the empire, which is why Kyiv, Novgorod, Thessaloniki, Ohrid and Sofia all had or have their own Hagia Sophia. The Istanbul building is the original and the model.

Three institutional facts describe what it was. It was the cathedral of the city, meaning the church where the bishop of Constantinople had his throne. It was the church of the Ecumenical Patriarch, one of the five ancient patriarchates of the undivided Church and, after Rome, the most senior in honour. And it was the imperial church, tied physically and ceremonially to the palace, where emperors were crowned on a disc of marble in the floor and where the court kept the great feasts.

Its later history is a sequence of changes of use, each of which can be dated. Latin crusaders took the city in 1204 and used the church as a Latin Catholic cathedral until Byzantine rule was restored in 1261. Ottoman forces took the city on 29 May 1453 and the building became a mosque. A decree of the Turkish council of ministers dated 24 November 1934 made it a museum. On 10 July 2020 the Turkish Council of State annulled that decree and a presidential decree returned the building to mosque use, which is its status now.

2. Three Churches on the Same Ground

The building you can see today is the third church on the site, and the two earlier ones both burned down in riots. Constantinople was founded as a Christian imperial capital by Constantine and dedicated in 330, and a great church on this ground belonged to the plan of the city from the start.

The First Church

The first Hagia Sophia was dedicated in 360 under Constantius II, the son of Constantine. Later Byzantine sources credit the project to Constantine himself, and modern historians generally treat the building as begun in his reign or shortly after and finished under his son. It was a conventional timber-roofed basilica, a long hall with aisles, of the kind being built across the empire in the fourth century. It burned on 20 June 404 in the rioting that followed the second exile of St John Chrysostom, the archbishop of the city, whose preaching against wealth and against the imperial court had made him enemies. The riot that destroyed the first Great Church was a Christian riot about a Christian bishop.

The Second Church

The second church was rebuilt and dedicated on 10 October 415 under Theodosius II. It was also a basilica, larger than the first. It stood for a little over a century and burned on 13 or 14 January 532 during the Nika riot, when the circus factions of the city turned on the emperor Justinian and set fire to a large part of the centre of Constantinople. Excavations in front of the present building in 1935 uncovered part of the monumental entrance porch of this Theodosian church, including a marble frieze carved with a procession of lambs. Those blocks are still displayed in the forecourt, and they are the oldest visible Christian remains on the site.

The Third Church

The third church is the one that stands. Justinian began it immediately after the riot, on 23 February 532, and it was dedicated on 27 December 537. Five years and ten months for a building of that size is extraordinarily fast, and the speed is part of why the structure has needed repeated repair ever since. Nothing about the design was conventional. The architects abandoned the timber-roofed basilica and put a dome of masonry over an enormous open square, a decision that had no real precedent at that scale.

Dates in this section follow the standard chronologies given in the Byzantine sources and in the Oxford Dictionary of Byzantium. The principal contemporary witness for the sixth-century building is Procopius of Caesarea, whose Buildings was written in the 550s, supplemented by the verse description delivered by Paul the Silentiary at the rededication of 562.

3. Justinian, the Nika Riot, and the Dome

The church exists because Justinian I decided, in the weeks after a revolt that nearly cost him his throne, to rebuild the burnt centre of his capital on a scale nobody had attempted. The Nika riot of January 532 began as a dispute at the hippodrome, turned into an insurrection, and ended with imperial troops killing the rioters in the hippodrome itself. Justinian emerged with his authority intact and a burnt city to rebuild, and the new Hagia Sophia was the centrepiece of what he built.

The Two Men Who Designed It

Justinian gave the commission to two mathematicians. Anthemius of Tralles and Isidore of Miletus are described in the sources as mechanikoi, men trained in geometry and mechanics, and Anthemius wrote on conic sections and on burning mirrors. Procopius says the emperor gave them the commission and that Anthemius took the lead. Their solution to covering the space was the pendentive dome: four huge piers carry four arches, the curved triangular surfaces between the arches gather the load, and the dome rests on the ring they form. Pendentives existed before them in smaller buildings. Nobody had used them to carry a dome of this diameter.

The Dome Fell, Twice

The original dome was shallower than the present one and it failed. Earthquakes in 553 and again in December 557 weakened the eastern arch, and the eastern half of the dome collapsed on 7 May 558, bringing down the ambo and the altar canopy with it. Justinian ordered a rebuild, entrusted to Isidore the Younger, a nephew of the original Isidore, who raised the profile of the dome by several metres so that it pushed downward more and outward less. The rebuilt church was rededicated on 24 December 562, and it is Isidore the Younger's dome, repeatedly patched, that is overhead today.

It failed again in part. The western arch and a section of dome came down in the earthquake of 989, and the repair was directed by Trdat, the Armenian architect who also built the cathedral of Ani. The eastern section fell in 1346 and was repaired over the following years. The dome is consequently not a true circle and its curvature varies noticeably from one quadrant to another, which surveyors have measured in detail.

Structural history and measurements follow Robert L. Van Nice's architectural survey Saint Sophia in Istanbul: An Architectural Survey, published by Dumbarton Oaks, which remains the standard measured record of the building. Earthquake dates follow the Byzantine chronicles as summarised in the Oxford Dictionary of Byzantium.

The Line About Solomon

A famous story has Justinian entering the finished church and saying "Solomon, I have surpassed you." The line is not in Procopius or in any sixth-century source. It appears in the Diegesis peri tes Hagias Sophias, a Greek narrative about the building's construction written centuries later and full of legendary material, including angels supervising the works. The story is a good indication of how Byzantines came to feel about the church. It is not evidence of what Justinian said.

4. How the Building Works

Hagia Sophia works by hiding its structure. The visitor stands in a rectangular hall about seventy metres by seventy-five metres internally, looks up, and sees a dome roughly thirty-one metres across whose crown is about fifty-five metres above the floor, apparently floating without support. The supports are there, arranged so that you do not read them as supports.

Dimensions are those recorded in Van Nice's survey for Dumbarton Oaks. Figures vary slightly between published surveys because the building is not regular and the dome is not a true circle.

The Ring of Windows

Forty windows are cut into the base of the dome, immediately above the point where the dome meets its supporting ring. Structurally this is the last place a cautious builder would weaken the masonry. Visually it is the whole point. Light enters in a continuous band beneath the dome, the springing of the dome disappears into glare, and the shell above appears to hang. Procopius wrote that the dome seemed suspended from heaven by a golden chain, and the effect he was describing is this one.

Half Domes and Piers

The thrust of the central dome is carried east and west into two half domes, and from those into smaller semi-domes over the exedrae, so that the load is passed down in stages through a cascade of curved surfaces before it reaches the ground. North and south, where there are no half domes, the thrust goes into massive piers and into buttresses that were added and thickened over the centuries, including work by the Ottoman court architect Mimar Sinan in the sixteenth century. The exterior is heavy and awkward for this reason. Everything elegant about the building faces inward.

The Marble and the Gold

Justinian's builders brought coloured stone from quarries across the empire: green verd antique from Thessaly, porphyry, white Proconnesian marble from the island of Marmara, red and yellow breccias from Asia Minor and North Africa. The wall panels are book-matched, meaning slabs sawn from the same block and opened like a book so that the veining mirrors itself, and the carved capitals are cut so deeply that the marble looks like lace. Above the marble the vaults were covered in gold glass tesserae. A later Byzantine reader of the building, Paul the Silentiary, spent hundreds of verses on the effect of lamplight on those surfaces at night.

A common tour-guide claim is that the columns were looted from the Temple of Artemis at Ephesus and from Egyptian temples. The claim is a medieval legend rather than an archaeological finding, and the study of the stone points to purpose-quarried material and to reused Roman columns of various origins. Where a page cannot verify a story, the honest thing is to say so.

Why It Mattered So Much

No church built in Christendom for centuries afterwards attempted a domed interior on this scale. Every later Byzantine church is in some sense a small answer to this building, Ottoman imperial mosque architecture from the fifteenth century onward is in open dialogue with it, and the dome of St Peter's in Rome belongs to a conversation that starts here. If you have stood under any large dome in a church, you have stood inside an idea worked out in Constantinople in the 530s.

The Vatican basilica that answered it has its own guide on this site: see St Peter's Basilica in Rome for what the Renaissance did with the same problem.

5. The Great Church at Worship

Hagia Sophia was a working cathedral, and everything unusual about its plan follows from the liturgy performed in it. The rite celebrated here shaped the worship of the whole Byzantine world, and it is still celebrated today by Orthodox Christians and by Eastern Catholics in communion with Rome.

The Liturgy

The Divine Liturgy of St John Chrysostom and the Divine Liturgy of St Basil the Great were the ordinary and the festal forms of the eucharistic service. Both are in continuous use. The Cherubic Hymn, sung at the transfer of the gifts to the altar, entered the rite in the sixth century, during the lifetime of this building. The Trisagion, "Holy God, Holy Mighty, Holy Immortal, have mercy on us," was sung here. The processions in and out of the building, through the narthex and the great bronze doors, carried the structure of the service, and the enormous open floor exists to allow them.

The clergy of the Great Church were numerous enough that an imperial edict of 535 tried to cap the establishment at several hundred, including priests, deacons, deaconesses, subdeacons, readers, cantors and doorkeepers, and the cap was evidently ignored. The service books that governed all of this, the Typikon of the Great Church, survive and can be read.

The staffing cap is Justinian's Novel 3 of the year 535, which sets numbers for the clergy of the Great Church and its dependent churches. The Typikon of the Great Church survives in tenth-century manuscripts and was edited by Juan Mateos in the 1960s.

The Emperor's Place

A large panel of inlaid coloured marble set into the floor of the nave, the omphalion, is traditionally identified as the place where the Byzantine emperor stood to be crowned by the patriarch. The emperor had his own entrance from the palace, his own place in the south gallery, and his own moment in the liturgy. The relationship between the empire and the Church in Byzantium was closer than anything in the medieval West, and the floor of this church is where that relationship was staged.

The Report of the Russian Envoys

The best-known description of worship here comes from the Russian Primary Chronicle, which recounts how envoys sent by Prince Vladimir of Kyiv to inspect the religions attended a service in Constantinople and reported that they did not know whether they were in heaven or on earth, for on earth there is no such splendour, and that God dwells there among men. Vladimir accepted Christianity in 988, and the Christianisation of the Rus followed.

The account is from the Russian Primary Chronicle, compiled in Kyiv in the early twelfth century, more than a hundred years after the events it describes. Historians read it as a later literary account of the conversion rather than as an eyewitness report, and it is quoted here as the tradition it is. The church the envoys attended is not named in the text, though the tradition identifies it with Hagia Sophia.

Whatever the chronicler's sources, the story records something real: this building was an instrument of evangelisation. Beauty preached here, and the Russian, Serbian, Bulgarian and Romanian churches all descend from missions that began in Constantinople. For the family tree that grew out of that, see the autocephalous Orthodox churches.

6. Iconoclasm and the Return of the Images

Hagia Sophia lost its figural images once before the Ottomans, and the people who removed them were Christians. The iconoclast controversy, which ran through the eighth and ninth centuries, was an argument inside the Byzantine Church about whether images of Christ and the saints could be venerated, and while the iconoclasts held power the images in this church came down.

What the Argument Was About

Iconoclasts held that making an image of Christ was either idolatry, forbidden by the second commandment, or else a Christological error, since a picture can show only the human nature and so either divides Christ or confuses the natures. They had a serious case and they made it in serious theological terms. Their opponents, above all St John of Damascus and later St Theodore the Studite, answered that the Incarnation itself changes what may be depicted: God has taken flesh and become visible, so the flesh he took may be shown, and the honour given to the image passes to the person represented.

The Church settled the question at the Second Council of Nicaea in 787, the seventh ecumenical council, which is received by Catholics and Orthodox alike. The council distinguished the veneration given to images from the worship due to God alone. Iconoclasm returned under imperial patronage from 815 and was finally ended on 11 March 843, a Sunday still kept in the Byzantine calendar as the Triumph of Orthodoxy.

The Mosaic of 867

On 29 March 867 the apse mosaic of the Virgin enthroned with the Christ Child was inaugurated, and Patriarch Photios preached a homily for the occasion which survives. He speaks of the image as though a long silence had been broken, and of seeing the Virgin as a mother holding her child. That homily is one of the clearest windows we have into how a ninth-century Christian looked at religious art. The mosaic is still in the apse.

The homily is Photios, Homily XVII, delivered in Hagia Sophia and translated in Cyril Mango's The Homilies of Photius, Patriarch of Constantinople. The date of 29 March 867 is given in the manuscript tradition of the homily.

7. The Mosaics and What They Show

The Christian mosaics of Hagia Sophia are a major surviving body of Byzantine imperial mosaic art gathered in one building. They were made over some seven centuries, from the sixth century to the thirteenth, and they were covered with plaster under Ottoman rule, which is the reason so much of them still exists. Plaster is a preservative. Chisels are not.

The Apse: The Virgin and Child

High in the semi-dome of the apse, above where the altar stood, the Mother of God sits enthroned with the Christ Child on her lap. She is roughly five metres high, in dark blue, and the ground is gold. This is the mosaic inaugurated on 29 March 867 after the end of iconoclasm. The archangel Gabriel survives on the arch to the right of her; the corresponding Michael is mostly lost. Of all the images in the building this is the one to look at first, because it is the Church's answer to a century of argument about whether the Incarnation may be painted.

The Imperial Door: An Emperor on the Ground

Over the central door from the narthex into the nave, the door reserved for the emperor, a tympanum mosaic shows Christ enthroned, giving a blessing and holding a book, with a bearded emperor prostrate at his feet. Medallions beside the throne show the Virgin and an archangel. The emperor is generally identified as Leo VI, who reigned from 886 to 912, and the mosaic is dated to around the end of the ninth century or the start of the tenth. Whoever he is, the composition is unmistakable in meaning: the ruler of the Roman Empire is on the floor.

The Southwestern Vestibule: Two Emperors and Two Gifts

Above the door of the southwestern vestibule, the Virgin sits with the Child between two standing emperors. Constantine offers her a model of the city he founded; Justinian offers a model of the church he built. The inscriptions name them. The mosaic dates to the late tenth century, some four hundred years after Justinian and six hundred after Constantine, so the two men are figures of memory rather than portraits. The image states the theology of Byzantine Constantinople in one picture: city and church alike are handed over to the Mother of God.

The South Gallery: The Deesis

The Deesis panel in the south gallery is the mosaic art historians write about most. Christ is shown between the Virgin and St John the Baptist, both turned towards him in intercession, which is what the Greek word deesis means: entreaty. The lower part of the panel is destroyed and the surviving faces are worn, which somehow adds to the effect. The modelling of the flesh in tiny tesserae, the sorrow in the Virgin's face, the softness of the whole thing after centuries of frontal, formal images, mark the change in Byzantine art usually called the Palaiologan renaissance. Most scholars date the panel to around 1261, when Byzantine rule was restored to the city, though a twelfth-century date has been argued.

The dating of the Deesis is disputed. The commonly cited date of about 1261 follows the argument associated with Thomas Whittemore and Otto Demus; an earlier twelfth-century date has been proposed by other scholars, including in the work of Robin Cormack. This page reports the disagreement rather than resolving it.

The Imperial Panels in the South Gallery

Two donor panels stand on the east wall of the south gallery. In the first, Christ is enthroned between the empress Zoe and Constantine IX Monomachos, who holds a purse representing a donation to the church. The heads and the inscription in this panel were altered, and the usual explanation is that Zoe married three times and the emperor's head and name were recut when the husband changed. In the second, from about 1122, the Virgin and Child stand between John II Komnenos and the empress Irene, who was Hungarian by birth and is shown with fair hair; their son Alexios is on the adjoining pier, painted in the thin face of a young man who died soon after.

The Seraphim and the Church Fathers

Four six-winged seraphim occupy the pendentives beneath the dome, their faces covered in the eastern pair and replaced by metal medallions during Ottoman use. One face was uncovered again during restoration work in 2009. On the north tympanum wall, standing figures of bishops and church fathers survive in part, including St John Chrysostom and St Ignatius of Antioch, from the ninth or tenth century. In the north gallery a rare mosaic portrait of the emperor Alexander, who reigned only from 912 to 913, went unnoticed by researchers for years because of where it sits.

The Graffiti

Cut into a marble parapet in the south gallery is a line of Norse runes, incomplete, generally read as containing the name Halfdan. A member of the Varangian guard, the Scandinavian troops who served the Byzantine emperors, scratched his name in church during a long service. A second runic inscription has been identified elsewhere in the gallery. Pilgrim and visitor graffiti in Greek, Latin, Armenian and other scripts are scattered around the building.

Identifications, dates and the dimensions given in this section follow the published reports of the Byzantine Institute of America and Dumbarton Oaks fieldwork, principally the work of Thomas Whittemore and Paul A. Underwood, and the standard surveys of Cyril Mango and Robin Cormack. Several of the dates are debated among specialists.

8. The 1054 Excommunication on the Altar

On Saturday 16 July 1054, in the middle of the afternoon service, three Roman legates walked up the nave of Hagia Sophia and laid a document on the altar excommunicating the Patriarch of Constantinople. The leader of the delegation was Cardinal Humbert of Silva Candida. The patriarch was Michael Cerularius. The legates then walked out, shook the dust from their feet, and left the city. A synod at Constantinople answered on 24 July with an anathema against the legates and their bull.

What Was Actually in Dispute

The bull's charges were a mixture of the substantial and the petty. The substantial ones concerned the Latin addition of the Filioque to the Creed and the authority of the see of Rome. The petty ones concerned the Latin use of unleavened bread in the Eucharist, clerical beards and clerical marriage. Both sides had been provoked. Latin churches in Constantinople had been closed, and Greek practice in southern Italy had been suppressed under Norman rule with Roman backing. The delegation had arrived in an atmosphere of mutual accusation and Humbert was not a diplomatic man.

Four Things That Are Usually Got Wrong

The first is that the bull excommunicated the Eastern Church. It did not. It named Michael Cerularius and his supporters. The second is that this act divided Christendom on that day. Historians of the schism, Catholic and Orthodox alike, generally treat 1054 as an incident in a long estrangement, with communion in many places continuing afterwards and with the real rupture consolidating over the following centuries.

The third is that the legates had authority. Pope Leo IX had died on 19 April 1054, three months before the bull was delivered, and the see was vacant. A papal legation's mandate ordinarily lapses with the death of the pope who issued it, which is why the canonical standing of the act has been questioned ever since. The fourth is that the excommunications still stand. They do not. On 7 December 1965, at the close of the Second Vatican Council, Pope Paul VI and Ecumenical Patriarch Athenagoras I issued a joint declaration expressing regret for the offensive words and acts of 1054 and removing the sentences of excommunication from the memory of the Church.

The joint Catholic-Orthodox declaration of 7 December 1965 is published in full on the Holy See website, and the corresponding papal brief is Ambulate in dilectione of the same date. The declaration removes the excommunications from the memory and midst of the Church; it does not by itself restore full communion, which remains the goal of the continuing theological dialogue.

The doctrinal substance of the division is treated on its own page: see the Great Schism of 1054 for the full account, the Filioque for the clause at the centre of it, and the papacy for the question of Roman authority that the bull raised.

9. The Sack of 1204 and the Latin Cathedral

The worst thing done to Hagia Sophia by Christians was done by Latin Christians in April 1204. The Fourth Crusade, diverted from Egypt into Byzantine dynastic politics and deep in debt to Venice, stormed Constantinople on 12 and 13 April 1204 and sacked the city for three days. The great church was stripped.

What Was Done

Byzantine and Latin sources agree on the outline. The altar was broken up for its silver and precious stones. The silver revetment was torn from the iconostasis and from the ambo. Mules and horses were brought into the nave to carry out the metal and slipped on the marble floor. Relics were carried off in quantity to churches across western Europe, where a good number of them still are. The Greek historian Niketas Choniates, who lived through it, describes a prostitute seated on the patriarch's throne singing bawdy songs, and his account is the source most often quoted.

The principal Byzantine account is Niketas Choniates, Historia, written by an eyewitness who was hostile to the crusaders. Latin accounts by Geoffrey of Villehardouin and Robert of Clari describe the plunder from the other side. Pope Innocent III's condemnation of the sack is preserved in his letters, notably his letter to the papal legate Peter Capuano.

What Rome Said About It

Pope Innocent III had forbidden the crusade to attack Christians and had excommunicated the participants of the earlier attack on Zara. When he learned what had happened at Constantinople he wrote in furious terms about the sacrilege, the plunder of churches and the violence done to the Greeks, saying that the crusaders had turned from the spoils of the infidel to the spoils of Christians and had given the Greeks reason to hate the Latins worse than dogs. That did not undo it, and the papacy went on to accept and organise the Latin Empire that the sack created.

Two modern popes have addressed it directly. On 4 May 2001, speaking to Archbishop Christodoulos of Athens, John Paul II said that for the occasions past and present when sons and daughters of the Catholic Church had sinned by action or omission against their Orthodox brothers and sisters, he asked the Lord's forgiveness, and he named the sack of Constantinople specifically. In June 2004, receiving Ecumenical Patriarch Bartholomew I, he spoke of the pain and disgust Catholics feel at what happened in 1204.

The Latin Cathedral, 1204 to 1261

For fifty-seven years Hagia Sophia was a Latin Catholic cathedral. A Venetian, Thomas Morosini, was installed as Latin patriarch, the liturgy was in Latin, and Latin clergy served the building. The Byzantine government in exile at Nicaea recovered the city on 25 July 1261 under Michael VIII Palaiologos, and the church returned to Orthodox use. A marble marker in the south gallery bears the name of Enrico Dandolo, the aged doge of Venice who led the Venetian contingent in 1204 and died in Constantinople in 1205. The marker is a nineteenth-century installation and where he was actually buried is not certain.

For the wider story of the crusading movement, its origins, its justifications and its record, see the Crusades.

10. Florence, 1452, and the Last Liturgy

Two attempts at reunion between Rome and Constantinople were made in the centuries before the city fell, and both ended in the same place: agreement signed by the delegations, rejection by the population. The second attempt was proclaimed in Hagia Sophia five months before the Ottoman conquest.

Lyon, 1274

The Second Council of Lyon in 1274 produced a union accepted by the Byzantine emperor Michael VIII Palaiologos, who needed western political support and who pressed it on his clergy. It was rejected by most of the Byzantine Church and by the monks in particular, and it collapsed after his death in 1282.

Ferrara and Florence, 1438 to 1439

The Council of Ferrara-Florence was a far more serious effort. The Byzantine emperor John VIII Palaiologos, the Patriarch of Constantinople and a large delegation of Greek bishops and theologians travelled to Italy and spent months in genuine theological debate on the Filioque, purgatory, the eucharistic bread and papal primacy. The decree of union Laetentur Caeli was promulgated on 6 July 1439 in Florence and signed by almost all the Greek delegates. St Mark of Ephesus refused to sign, and he is honoured as a saint in the Orthodox Church for that refusal.

The union failed at home. The Greek delegates who signed found their people would not accept it, several withdrew their signatures, and the eastern patriarchates repudiated it. Orthodox Christians generally judge that the Greek delegation was under political duress, negotiating for military aid against the Ottoman advance, and that a union bought under that pressure could not bind the Church. That judgment deserves to be stated in its own terms before any Catholic response is offered. The Catholic Church, for its part, holds Florence to be an ecumenical council and its decree to be a true statement of the faith. Both bodies now agree, at least, that reunion cannot be arranged over the heads of the faithful.

12 December 1452

On 12 December 1452, with the Ottoman army expected in the spring, the union of Florence was formally proclaimed in Hagia Sophia at a liturgy celebrated by Cardinal Isidore of Kiev, a Greek who had signed at Florence and had been made a cardinal. The pope was commemorated by name. Much of the population stayed away, and many who did not attend regarded the church as defiled afterward. The Byzantine chronicler Doukas attributes to the grand duke Loukas Notaras the remark that he would rather see the turban of the Turk in the middle of the city than the Latin mitre.

The Notaras remark is reported by the Byzantine historian Doukas, writing after the fall of the city, and is not independently attested. Historians treat it as a piece of hostile reporting that captures a real current of feeling rather than as a verified quotation, and it is given here on that basis.

The Last Christian Service

On the night of 28 May 1453, with the final Ottoman assault expected before dawn, the emperor Constantine XI, the clergy and a large part of the population gathered in Hagia Sophia for a vigil. Latin and Greek clergy served together. Contemporary and near-contemporary accounts describe the church filled, communion given, and the emperor going out from the service to the walls. That was the last Christian liturgy in the building for which there is a continuous history. The city fell the following morning.

11. 1453: The Fall and the Conversion

Constantinople fell to the army of Mehmed II on Tuesday 29 May 1453 after a siege of fifty-three days. The city's population, or as much of it as could reach the building, had taken refuge inside Hagia Sophia, and Ottoman soldiers broke the doors during the sack. Those inside were enslaved or killed according to the customs of a city taken by storm, which is what the sources on both sides describe.

What Mehmed Did

Mehmed II entered the church during the day, stopped the destruction of the fabric, and ordered the building converted into a mosque. Ottoman and Greek sources agree on the substance. A mihrab, the niche indicating the direction of prayer, was installed, and the first Friday prayer was held on 1 June 1453. The sultan later constituted the building and its revenues as a waqf, an Islamic religious endowment, a legal fact that became decisive again in 2020.

He also, within months, permitted the election of a new Orthodox patriarch, Gennadios Scholarios, and gave the patriarchate a legal standing within the Ottoman system. Christianity in the city continued under Ottoman rule with defined disabilities: legal inferiority, a special tax, restrictions on building and repairing churches, and periodic conversions of churches to mosques. The Ecumenical Patriarchate has remained in the city, and it is still there, at the Church of St George in the Phanar district.

The date of the first Friday prayer and the establishment of the endowment follow Ottoman chronicles and the surviving foundation documents as reported in standard Ottoman scholarship. Accounts of the sack rely on the Greek eyewitness and near-contemporary sources, principally Doukas, Sphrantzes and Kritovoulos, and on Ottoman sources, which differ in emphasis.

Why Hagia Sophia in Particular

Converting the principal church of a conquered capital was a public statement about who now ruled. Mehmed took the title Kayser-i Rum, Caesar of Rome, and presented himself as successor to the empire he had defeated. Hagia Sophia's conversion was part of that claim, and the building became the model for Ottoman imperial mosque architecture that followed, from the Sehzade and Suleymaniye of Mimar Sinan to the Sultan Ahmed mosque across the square. Ottoman architects spent a century answering the dome that Anthemius and Isidore had raised.

The Legend of the Priest in the Wall

Greek tradition holds that a priest was in the middle of the liturgy when the soldiers broke in, that he walked into the wall of the sanctuary carrying the chalice, and that the wall closed behind him, and that when the church is a church again he will come out and finish the liturgy. The story is folklore and it is recorded as such. It is worth knowing, because it tells you what the loss of this building has meant in Greek memory for five and a half centuries. Grief that lasts that long turns into stories.

12. What the Ottomans Added and Covered

Ottoman use changed the building in two directions at once. New elements were built for Islamic worship, and Christian figural images were gradually covered. The building was also structurally rescued more than once by Ottoman patronage, a fact that Christian accounts sometimes omit.

What Was Built

The four minarets went up over roughly a century and are not identical: the earliest is attributed to the years after 1453, one to the reign of Bayezid II, and two matching brick minarets to the later sixteenth century in the period of Selim II and Murad III. Inside, a mihrab was set into the apse, angled slightly off the church's axis because Mecca does not lie due east of Istanbul, and a minbar, the stepped pulpit for the Friday sermon, was installed beside it. A raised sultan's lodge, tombs of sultans in the precinct, ablution fountains, a library and a primary school were added over the centuries.

Mimar Sinan, the chief architect of the Ottoman court, worked on the building in the sixteenth century, strengthening the buttresses and consolidating the structure. Given the fragility of a dome that had already partly collapsed three times, this work is a significant reason the building is still standing.

The Calligraphic Roundels

Eight enormous circular panels hang at gallery level bearing the names of God, Muhammad, the first four caliphs and the grandsons of Muhammad in gold on green. They were made by the calligrapher Kazasker Mustafa Izzet Efendi in the nineteenth century, during the restoration of 1847 to 1849. They are the strongest visual signal in the interior today, and they hang in front of Christian mosaics without covering them.

The Fossati Restoration, 1847 to 1849

Sultan Abdulmejid I commissioned the Swiss-Italian brothers Gaspare and Giuseppe Fossati to restore the building. They consolidated the dome and vaults, straightened columns, and in the course of the work uncovered many of the Byzantine mosaics that had been plastered over. They recorded what they found in drawings, some of which survive and were published, and then covered the figural mosaics again in accordance with the building's use as a mosque. The Fossati record is one of the main sources for what exists behind plaster where plaster remains.

What Covering Actually Meant

Figural images were plastered and painted over, in stages rather than all at once, and there is evidence that some mosaics remained visible for a long period after 1453 before being covered. Non-figural gold ground survived in many places. Faces on the seraphim were masked with metal medallions. The practical consequence is that the mosaics were sealed away from light, damp, candle smoke and hands for centuries, which is a large part of why the Deesis and the apse Virgin still exist to be looked at. Iconoclasm inside the Byzantine Church itself destroyed more Christian figural art in this building than the Ottoman conquest did.

The Fossati drawings and reports are published in the scholarly literature on the restoration, and the sequence of covering is reconstructed from those records together with the excavation and conservation reports of the Byzantine Institute of America. The relative destruction attributed to iconoclasm rests on the fact that the surviving figural mosaics all postdate 843, which is the standard scholarly observation about the building's decoration.

13. 1934: The Museum

Hagia Sophia stopped being a mosque by a decree of the Turkish council of ministers dated 24 November 1934, and opened as a museum the following year. The decision belonged to the wider programme of the new Turkish Republic under Mustafa Kemal Ataturk, which abolished the caliphate in 1924, secularised law and education, and reordered the relationship between the state and religion.

What Changed

Islamic worship in the building ceased. Carpets were lifted, revealing the Byzantine marble floor and the omphalion. The uncovering and conservation of the mosaics, begun in 1931 by the Byzantine Institute of America under Thomas Whittemore with the permission of the Turkish government, continued and expanded, and the Deesis and the imperial panels came back into view. Dumbarton Oaks, the Byzantine research institute in Washington, carried the work forward after Whittemore's death, and the reports published from that fieldwork are still the standard record.

Christian worship did not resume either. The museum was a place where no one prayed, which is what made it usable as a shared monument. Both the calligraphic roundels and the Christian mosaics were displayed, side by side, as the layers of one history. The building was inscribed on the UNESCO World Heritage list in 1985 as part of the Historic Areas of Istanbul.

How It Was Understood

For eighty-five years the museum functioned as a rare piece of common ground. Orthodox and Catholic Christians could stand under the apse mosaic, Muslims could look up at the roundels, and neither group's claim was being enacted at the other's expense. Visitors came to it from around the world. The arrangement was fragile because it satisfied nobody's maximum position, and it survived for as long as it did because a neutral use avoided a contest that has no obvious settlement.

The 1934 decree, the 1985 UNESCO inscription and the history of the Byzantine Institute campaign are all matters of public record, documented respectively in the Turkish official gazette, the UNESCO World Heritage list entry for the Historic Areas of Istanbul, and the published fieldwork reports of the Byzantine Institute and Dumbarton Oaks.

14. 2020: The Return to Mosque Use

On 10 July 2020 the Turkish Council of State, the country's highest administrative court, annulled the 1934 cabinet decree, and a presidential decree issued the same day transferred Hagia Sophia to the Directorate of Religious Affairs for use as a mosque. The first Friday prayers were held on 24 July 2020. That is the building's status as this page is written.

The Legal Reasoning

The court's ruling turned on the endowment. Mehmed II had constituted the building as a waqf after 1453, and Turkish law protects the purposes for which an endowment was established. The Council of State held that the 1934 decree had unlawfully diverted the property from the purpose fixed in its founding deed, and annulled it. The argument was about property law and endowment deeds rather than about theology.

How Christian Leaders Responded

Pope Francis spoke about it at the Angelus on 12 July 2020, saying that his thoughts went to Santa Sophia and that he was greatly pained. Ecumenical Patriarch Bartholomew I of Constantinople, who lives in the city, had said before the decision that converting the building would disappoint Christians and would fracture two worlds rather than unite them. The World Council of Churches wrote to the Turkish president expressing grief and dismay. The Russian Orthodox Church, the Church of Greece and the Orthodox Church of Cyprus objected. UNESCO stated its regret that the change had been made without prior discussion and asked for review of the state of conservation.

The papal remark was made in the Angelus address of 12 July 2020, published on the Holy See website. Patriarch Bartholomew's remarks were reported from his address of 30 June 2020. The World Council of Churches letter of 11 July 2020 and the UNESCO statement of 10 July 2020 are published by those bodies.

What Actually Happens in the Building

The building functions as a mosque, under the Directorate of Religious Affairs, with prayers held. Visitors of any religion are admitted outside prayer times and the Turkish authorities have consistently stated that access continues. The figural mosaics have not been destroyed or plastered over. During prayers the mosaics in the apse and elsewhere in the sightline are covered with curtains or screening, and they are uncovered at other times. Restoration work on the structure has been under way, and arrangements for visitors have changed more than once since 2020.

Two things follow from that description. The Christian art survives and can still be seen, which is the fact that matters most for anyone who cares about the mosaics. And a building consecrated for Christian worship is now used for the worship of another religion, which is a real loss and no amount of goodwill about access changes it. Both sentences are true.

15. What Survives and What Is Visible

A visitor to Hagia Sophia today walks into a Byzantine church interior with Ottoman furniture in it. The sixth-century structure, the marble revetment, the carved capitals, the galleries and a substantial number of the mosaics are in place, together with the mihrab, the minbar, the sultan's lodge, the calligraphic roundels and the carpet. Nothing is disguised. The whole history is legible at once.

The Christian Elements Still There

The apse mosaic of the Virgin and Child of 867 is in place above the mihrab. The Deesis, the Zoe panel and the Komnenos panel are in the south gallery. The Christ Pantocrator with the prostrate emperor is over the Imperial Door, and the Constantine and Justinian panel is in the southwestern vestibule. The seraphim are on the pendentives. Church fathers survive on the north tympanum. The omphalion is in the nave floor. Crosses that were converted into other motifs during Ottoman use can be traced in the vaults, and outlines of removed crosses remain visible in several places. Outside, the fifth-century lamb frieze from the Theodosian church lies in the forecourt. The Norse runes are in the gallery parapet.

What Is Gone

The altar, the iconostasis, the ambo, the silver furnishings and the relics went in 1204. The great dome mosaic, whatever it was, is gone and the crown of the dome carries Arabic calligraphy. Many figural mosaics recorded by the Fossatis in 1847 have not been re-exposed and some are lost. Byzantine liturgical objects from the church are dispersed across European treasuries, with a significant group at San Marco in Venice.

Visiting as a Christian

Practical arrangements at the site change and this page will not print details that go stale. What holds is the manner of the visit. The building is a working mosque, which means the etiquette of a mosque applies: modest dress, shoes removed where required, quiet, no interruption of anyone at prayer, and no photographing people praying. A Christian may pray silently anywhere, and there is no reason a Catholic standing beneath the apse mosaic should not say the Creed interiorly and mean it. Overt Christian liturgical acts inside would be a provocation and the right instinct is against them.

Hagia Sophia belongs to a wider route of Christian sites in the country, from the churches of the Seven Churches of Revelation to Cappadocia and Antioch: see Christian sites in Turkey for the rest of them, and the seven churches of Revelation for the biblical cities themselves. If you want the practice rather than the itinerary, what a pilgrimage actually is sets that out, and virtual pilgrimage is for readers who will not travel.

16. How Christians Should Think About It

Hagia Sophia produces strong feeling in Christians who have never seen it, and the feeling is legitimate. A church built for the Eucharist and used for it for nine centuries, holding the images the Church fought a war of ideas to keep, is not an ordinary monument, and grief at its loss is honest. What that grief becomes next is where care is needed.

What the Church Teaches About Buildings

Catholic teaching values consecrated churches highly and treats their profanation as a serious matter, while refusing to make any building necessary to salvation. Christ told the Samaritan woman that the hour was coming when the Father would be worshipped neither on Gerizim nor in Jerusalem but in spirit and truth (John 4:21-24). He said of the Temple that not one stone would be left on another (Mark 13:2). Stephen, before he was stoned, said that the Most High does not dwell in houses made by hands (Acts 7:48). The Church builds beautifully because the Incarnation makes matter capable of carrying grace, and the Church survives the loss of what it builds because the Church is a people rather than a property portfolio.

What Orthodox Christians Feel, in Their Own Terms

For Greek Orthodox Christians in particular, Hagia Sophia is the mother church of their tradition and the loss of it in 1453 is bound up with the end of the Byzantine world, centuries of subject status and the destruction of Greek Christian life in Anatolia in the twentieth century. The hymn beginning "I remember, O Lord" and the folk tradition of the unfinished liturgy carry that memory. When Orthodox Christians speak of Hagia Sophia they are speaking about a wound in the body they belong to, and Catholics who want to be trusted by them should listen to it without correcting it.

Catholic teaching regards the Orthodox churches as true churches possessing valid orders and the Eucharist, so close that the Catechism says the communion between them and the Catholic Church is so profound that it lacks little to attain the fullness that would permit a common celebration of the Lord's Eucharist (CCC 838). That is the ground on which a Catholic mourns with them rather than about them.

What Not To Do With This Story

Three temptations follow the subject around. The first is contempt for Muslims, which the Church rejects: the Second Vatican Council's declaration Nostra Aetate teaches that the Church regards Muslims with esteem, naming their adoration of the one God, and calls Christians and Muslims to forget the quarrels of the past and work together. Losing a building to another religion is a grief, and a grief licenses nothing.

The second is a fantasy of reconquest, in which the answer to 1453 is a future in which the flag changes again. Christians hold the churches they hold by the law of the places they live in, and a Christianity that wants its buildings back by force has forgotten what happened in 1204, when Christians did exactly that to this church.

The third is date-setting: reading the fate of this building as a sign on a prophetic calendar. The Church's own teaching is that no one knows the day or the hour (Mark 13:32). What Hagia Sophia demands of a Christian is repentance for division, prayer for unity, and the ordinary duty of readiness that belongs to every day. A timetable is exactly what the Church says nobody has. The site's page on ecumenism and the search for Christian unity covers what the Church is actually doing about the split this building witnessed, and the Eastern Orthodox Church explains who the other party is.

17. Frequently Asked Questions