Molla Gürani Mosque
The structure is thought to have been built at the end of the 11th century or the beginning of the 12th century, during the reign of Emperor Alexios I.
After the Fourth Crusade, during the period when Constantinople was under Latin control, it was used as a Roman Catholic church.
Shortly after the Ottoman conquest of Istanbul, the church was converted into a mosque by Molla Gürani, a scholar and the teacher of Sultan Mehmed the Conqueror.
