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The inauguration of the Hagia Sophia was in 11 May 330.
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Hagia Sophia in 537-1453 was served as an Eastern Orthodox cathedral and the seat of the ecumenical patriarch of Constantinople, except between 1204 and 1261, when it was converted by the Fourth Cruseders to a Roman Catholic cathedral under the Latin Empire.
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Hagia Sophia was turned into a mosque in 1453-1935.
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Restoration of the Hagia Sophia was ordered by Sultan Abdulmecid and completed by eight hundred workers between 1847 and 1849, under the supervision of the Swiss-Italian architect brothers Gaspare and Giuseppe Fossati.
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Hagia Sophia was turned into a museum in 1934.
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Turkish President Erdogan again suggests converting Hagia Sophia into a mosque.