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The Monastery of Christ the Almighty (Pantokrator) was founded by Ioannes II Komnenos (1118-1143) and his wife Eirene, a born princess of Hungary, and built between 1118 and 1137. The south church was built first, then the north church was added, and finally a grave chapel with two oval domes was constructed in the space between both churches after their outer halls in this area had been demolished. This monumental ensemble is the greatest church building in Istanbul after the time of Justinian I, and it is the only of the later time one where we know the name of the architect, Nikephoros. The monastery is known in detail from the surviving foundation document where its buildings, the life of the monks there and the hospital connected to it are described. In the grave chapel, a number of emperors were buried including Ioannes and Eirene themselves, Manuel I Komnenos (1143-1180) and Manuel II Palaiologos (1391-1425). In 1453, the churches were converted into a mosque. After a long time of decay, a restoration is now under way.

(www.arkeo3d.com/byzantium1200/pantocra.html)

Today Zeyrek Mosque is - after Hagia Sophia - the second largest extant religious edifice built by the Byzantines in Istanbul.
Until a few years ago, the edifice was in a desolate state, and as a result it was added to the UNESCO watchlist of endangered monuments. During the recent years it underwent extensive (albeit still unfinished) restoratio

Fatih - Istanbul

Remains of the Latin imperial palace.
Fener and Balat neighborhoods - Istanbul

Fener and Balat neighborhoods - Istanbul