Koca Mustafa Pasha Mosque

Koca Mustafa Pasha Mosque is a former Byzantine church in Istanbul, Turkey, converted into a mosque between 1486 and 1491 by Koca Mustafa Pasha. Originally dedicated to Saint Andrew of Crete, its foundation dates back to the 6th century.

The building was first constructed in the 5th century as a monastery and later rebuilt in 1284 by Princess Theodora Raoulaina. After the Ottoman conquest, it was converted into a mosque and also served as a dervish lodge. Over the centuries, it underwent multiple restorations, including a dome reconstruction after the 1766 earthquake.

The mosque retains elements of its original Byzantine ambulatory design but was significantly altered during the Ottoman period. It features a central dome, half-domes, barrel vaults, and an outer narthex. The exterior, made of polished stone, reflects Ottoman architectural style. An underground cistern remains as the last remnant of the original Byzantine monastery.

Address
Koca Mustafapaşa Caddesi 183, Istanbul, Turkey

Established
1284