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
Shirakavan (ancient city) the church survived. Other parts of ancient Shirakavan were flooded by the waters of a dam built on the Akhurian River. Shirakavan (ancient city) Shirakavan (); founded as Yerazgavors and later Yerazgavork, was a medieval Armenian city and one of the 13 historic capitals of Armenia, serving as a capital city between 890 and 929 during the Bagratid Kingdom of Armenia. The city was located on the right bank of Akhurian River to the northeast of Ani, corresponding with the current village of Çetindurak of Akyaka district of Kars Province, within the Republic of Turkey. The earliest mentions of Shirakavan