Hirami Ahmed Pasha Mosque
Istanbul, Turkey · built 1101
Hirami Ahmet Pasha Mosque (Hırami Ahmet Paşa Mescidi) is a former Eastern Orthodox church converted into a mosque by the Ottomans. The small church, one among the 36 dedicated to Saint John the Baptist in Constantinople, was part of a monastery bearing the same name. Its full name was Saint John the Forerunner by-the-Dome (Ἃ Ἰ ὁ ἐ ῷ ῳ, Hagios Ioannis ho Prodromos en tō Trullō). It is the smallest Byzantine church of Constantinople still extant and has never been studied.
Mosque data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).