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When did Hagia Sophia become a mosque under the Ottoman Empire?
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Hagia Sophia
A bird's-eye view of Hagia Sophia on the shore of the Bosporus, Istanbul.
Sultan Mehmed II designated the Hagia Sophia as a mosque immediately following his conquest of Constantinople in 1453. Upon entering the city, he proceeded directly to the structure to initiate its conversion, subsequently establishing charitable foundations to support its maintenance and service.12