Zeyrek Mosque built
1136 CE.
Shown on the map at 41.020°, 28.957°.
Zeyrek Mosque (Turkish: Zeyrek Camii) or the Monastery of the Pantokrator (Greek: Μονή του Παντοκράτορος Χριστού; Turkish: Pantokrator Manastırı), is a large mosque on the Fazilet Street in the Zeyrek district of Fatih in Istanbul, overlooking the Golden Horn. It is made up of two former Byzantine churches and a chapel joined together and represents the best example of Middle Byzantine architecture in Constantinople. After Hagia Sophia, it is the largest Byzantine religious edifice still standing in Istanbul. It is less than 1 km to the southeast of Eski Imaret Mosque, another Byzantine church that was turned into a mosque. East of the complex is an Ottoman Konak which has been restored and opened as a restaurant and tea garden called Zeyrekhane.
Text from the Wikipedia article Zeyrek Mosque, licensed CC BY-SA 4.0.