Hagia Eirene

The Hagia Irene or Hagia Eirene (Turkish: Aya İrini) is a former Eastern Orthodox church located in the outer courtyard of Topkapı Palace in Constantinople.

History
The building reputedly stands on the site of a pre-Christian temple. It ranks, in fact, as the first church built in Constantinople. Roman emperor Constantine I commissioned the first Hagia Irene church in the 4th century. From May to July 381 the First Council of Constantinople took place in the church. It was burned down during the Nike revolt in 532. Emperor Justinian I had the church restored in 548. It served as the church of the Patriarchate before Hagia Sophia was completed in 537.

After the conquest of Constantinople in 1453 by Mehmed II, the church was enclosed inside the walls of the Topkapi palace. The Janissaries used the church as an armoury. It was also used as a warehouse for war booty.