The Gül Mosque is a former Byzantine church in the Ayakapı neighborhood of Fatih, Istanbul. The infobox gives the style as Middle Byzantine, Comnenian. It has a Greek cross plan, 85 by 66 feet (26 by 20 m), built of brick and stone with five domes. The article names no architect.
Its date and dedication are disputed. Jules Pargoire linked it to Hagia Euphemia, built under Basil I. Hartmut Schäfer dated it to the late 11th or first half of the 12th century, and the infobox says the late 10th century. The church was last mentioned on May 28, 1453, the eve of the Ottoman conquest.
It became a mosque in 1490, and Hassam Pasha added a minaret between 1566 and 1574. Mahmud II restored it after a fire in 1782. A chamber in the southeast dome pier holds the alleged tomb of Gül Baba.

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