His first act was to ride to Haghia Sophia and order that it be converted into a mosque; on the following Friday, he attended the first Muslim prayers in what came to be called Ayasofya Camii (Mosque of Haghia Sophia).
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It took less than two weeks to transform Haghia Sophia into a mosque.
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He prayed in Ayasofya Camil (Mosque of Haghia Sophia) for the first time on a Thursday.