Hagia Irene (church building) built
350 CE.
Shown on the map at 41.010°, 28.981°.
Hagia Irene (Greek: Αγία Ειρήνη) or Hagia Eirene (Medieval Greek: Ἁγία Εἰρήνη Ancient Greek pronunciation: [aˈʝia iˈrini], "Holy Peace", Turkish: Aya İrini), sometimes known also as Saint Irene, is a former Eastern Orthodox church located in the outer courtyard of Topkapı Palace in Istanbul. It is the oldest known church structure in the city and one of only two Byzantine churches still standing in Istanbul today that were never converted into mosques, alongside the Church of Saint Mary of the Mongols, as it was used as an arsenal for storing weapons until the 19th century. The Hagia Irene now operates as a museum and concert hall.
Text from the Wikipedia article Hagia Irene, licensed CC BY-SA 4.0.