Hagia Sophia (as a mosque)

Hagia Sophia (as a mosque)
source
Name	Hagia Sophia (as a mosque)
Location	Istanbul, Fatih, Turkey
Religious affiliation	Islam
Rite	Sunni
Status	Mosque
Architecture type	Church converted to mosque
Architecture style	Byzantine, Ottoman
Groundbreaking	532 (original)
Completed	537 (original)
Materials	Brick, mortar, stone, marble

Hagia Sophia (as a mosque)

Hagia Sophia (as a mosque) refers to the building in Istanbul that functioned as an Islamic place of worship after the Fall of Constantinople in 1453 and again following its reconversion in 2020. Its transformation and use intersect with the histories of the Byzantine Empire, the Ottoman Empire, Republic of Turkey, and international cultural institutions such as UNESCO and the European Court of Human Rights.

History as a Mosque

After the Fall of Constantinople on 29 May 1453, the Ottoman Sultan Mehmed II ordered the conversion of the former Byzantine Empire cathedral into a mosque. The change followed precedents in Constantinople such as the conversion of the Church of the Holy Apostles and reflected Ottoman policies similar to those applied in Edirne and Bursa. Over the reigns of sultans including Suleiman the Magnificent, Selim II, and Ahmed I, the building served as the imperial mosque of the Ottoman court and hosted state ceremonies involving figures like Grand Vizier and military elites of the Janissaries. During the Tanzimat era under Mahmud II, and the late Ottoman reforms influenced by contacts with France, Britain, and Russia, debates about preservation and modernization affected the structure. Following the establishment of the Republic of Turkey under Mustafa Kemal Atatürk, the site was secularized and converted into a museum in 1935 by the Turkish Ministry of Culture and the Directorate of Antiquities, reflecting interwar heritage policies and engagement with organizations such as International Committee of the Blue Shield.

In July 2020, the Council of State (Turkey) annulled the 1934 decision and the building was reconverted into a mosque by decree of President Recep Tayyip Erdoğan. The reconversion reignited legal and diplomatic threads involving the European Court of Human Rights, UNESCO World Heritage Committee, and national ministries in Turkey.

Architecture and Modifications during Ottoman Period

Ottoman architects and artisans adapted the Byzantine basilica and central dome designed by Anthemius of Tralles and Isidore of Miletus with Islamic elements. Prominent additions included the four massive minarets erected during the reigns of Fahreddin Pasha-era patrons and later sultans, a mihrab aligned toward Mecca replacing the apse, and a minbar installed by imperial craftsmen. Large calligraphic roundels bearing names such as Muhammad, Abu Bakr, Umar, Uthman, Ali, Hasan ibn Ali, and Husayn ibn Ali were hung by conservators. Structural reinforcements by Mimar Sinan's school and later Ottoman engineers addressed seismic damage, similar to works in Topkapı Palace and Süleymaniye Mosque; interventions included buttressing, masonry repairs, and the application of lead sheathing on the dome. Decorative programs combined Byzantine mosaics with Ottoman tilework and carpets from workshops in Bursa, Iznik, and Istanbul's imperial ateliers, paralleling commissions for Blue Mosque and Rüstem Pasha Mosque.

Religious Function and Practices

As the imperial mosque, the building hosted Friday congregational prayers led by appointed imams and qadis connected to the Sultanate, and served as a locus for Ottoman ritual life, including the proclamation of new sultans and circumcision ceremonies associated with the Ottoman dynasty. The liturgical schedule followed the Ottoman Sunni Hanafi rites and incorporated sermon delivery by notable clerics from institutions like Süleymaniye Complex and Istanbul University (Ottoman Imperial School). During Ramadan, the site received royal endowments (waqf) similar to those sustaining Eyüp Sultan Mosque and Yeni Mosque. Educational and charitable functions tied it to Ottoman waqf networks administered by institutions such as the Defterdar and Vakfiye registries.

Administration and Ownership

Administration transitioned from Byzantine ecclesiastical authorities to the Ottoman imperial chancery (the Divan), with ownership and endowments recorded in waqf deeds. The site’s governance involved offices like the Sahib-i Vakıf and later the General Directorate of Foundations (Turkey), reflecting Ottoman and Republican legal regimes. After 1935, the Republic of Turkey administered the site through the Ministry of Culture and Tourism and the Directorate General of Foundations until the 2020 administrative order transferring control to the Presidency of Religious Affairs (Diyanet), an institution formed in the early Republic and responsible for mosque administration across Turkey.

Renovation, Conservation, and Adaptive Reuse

Conservation campaigns spanned Ottoman, Republican, and international periods, involving artisans and specialists from institutions such as Istanbul Archaeological Museums, the General Directorate of Cultural Heritage and Museums (Turkey), and international teams influenced by conservation charters like the Venice Charter. Notable restoration phases addressed seismic retrofitting after earthquakes affecting Istanbul Province and conservation of Byzantine mosaics uncovered during archaeological work by scholars linked to Dumbarton Oaks and universities including Oxford University, University of Chicago and University of Cambridge. Debates about adaptive reuse invoked comparative cases like the conversion of the Mezquita-Catedral de Córdoba and disputes over heritage management practices endorsed by ICOMOS and UNESCO.

Public Reception, Controversies, and International Response

The building’s status has been a focal point of international diplomacy, cultural heritage debates, and public opinion across actors such as the European Union, the United States Department of State, the Russian Federation, the Greek Orthodox Church, the Ecumenical Patriarchate of Constantinople, and civil society groups including Human Rights Watch. Controversies have centered on religious access, conservation of Byzantine mosaics, and Turkey’s commitments under the World Heritage Convention. Responses ranged from formal statements by foreign ministries and resolutions in bodies like the Parliament of Greece to commentary in international media and interventions by cultural NGOs, mirroring tensions seen in other contested sites such as Jerusalem and Bethlehem.

Category:Mosques in Istanbul