The Stoudios monastery was established in the early 5th century, and has been occupied for much of its existence since then. The church that remains is the oldest in Istanbul. This entry largely deals with the middle period of its history: from Sabas' and then Theodore's appointment as abbot in Byzantium's Iconoclastic period during the late 8th century; through to the Ottoman seizure of the city in 1453. It was occupied by different groups before and after who were no less interesting, but are less well documented. This was one of the most important and largest monasteries in the Byzantine capital of Constantinople from Theodore's appointment through to the 13th century Latin crusade. It was a crucial institution in its own right within th...