Ä°mrahor Ä°lyas Bey Mosque (Studios Monastery): It is constructed between Samatya and Yedikule on 463. The building, which is one of the former buildings of Istanbul, is devoted to baptist Yohannes. The 13th century floor mosaics can be seen on the floor of the building.After the conquest of Ä°stanbul, the structure was converted int o a mosque by Ä°lyas Bey in 1486. Afterwards the building had been exposed to various damages as a result of various earthquakes and fires, and in 1908 its roof collapsed and rendered any kind of restoration impossible;therefore the mosque still bares its destructed view.

During Latin invasion the church-monastery was destroyed for the most part. In XIII. Century the much needed repairs were made and it was surrounded with thick walls. After the conquest of Istanbul, the building was turned into a mosque by Ä°lyas Bey in 1486. The building which was destroyed in time due to earthquake and fire was left unrepaired, existing in the same state to date.

Imrahor Monument which is in Yedikule and which is also known as Ä°lyas Bey Mosque is one of the most ancient structures of Byzantine Period in Istanbul, and was constructed in 5th century. Monastery and the church, known as Studios, having the name of its architect, kept its position as an important religious center in Byzantine Period.