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
Ecbatana and Pasargadae and that one of the last acts of his life was to visit the city. The citadel of Ecbatana is also mentioned in the Bible in Ezra 6:2, in the time of Darius I, as part of the national archives. Although historians and archaeologists now believe that "the identification of Ecbatana with Hamadān is secure," earlier visitors to the site were unable to find significant remains of the Median and Achaemenid periods, which led them to suggest other sites as the location of Ecbatana. Assyrian sources never mention Hagmatana/Ecbatana. Some scholars believed the problem can be resolved by