Dioceses of the Church of the East to 1318 to represent them. None of these four dioceses is mentioned again, and it is not clear when they lapsed. By the end of the 5th century there were at least three East Syriac dioceses in the Sassanian province of Media in western Iran. Canon XXI of the synod of Isaac in 410 foreshadowed the extension of the metropolitan principle to the bishops of Beth Madaye and other relatively remote regions. Hamadan (ancient Ecbatana) was the chief city of Media, and the Syriac name Beth Madaye (Media) was regularly used to refer to the East Syriac diocese of Hamadan as well
Bagaran (ancient city) south of the site of the ancient city. Nowadays, a small Kurdish-populated village called Kılıttaşı partially lies on the ruins of Bagaran, on the Turkish side of the closed border. According to the Armenian historian Joseph Orbeli, the Church of Saint Theodore of Bagaran was one of the most prominent examples of early medieval Armenian architecture. It was largely intact until 1920. However, it was deliberately destroyed by the Turkish authorities. Bagaran (ancient city) Bagaran (), was a city in Ancient Armenia founded during the reign of the Orontid Dynasty. It is one of the Historical capitals of ancient Armenia.