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
Medes knew of or reached during their expansion until the beginning of the 7th century BC. In Achaemenid sources, specifically from the Behistun Inscription (2.76, 77–78), the capital of Media is Ecbatana, called "Hamgmatāna-" in Old Persian (Elamite:"Agmadana-"; Babylonian: "Agamtanu-") corresponding to modern-day Hamadan. The other cities existing in Media were Laodicea (modern Nahavand) and the mound that was the largest city of the Medes, Rhages (present-day Rey). The fourth city of Media was Apamea, near Ecbatana, whose precise location is now unknown. In later periods, Medes and especially Mede soldiers are identified and portrayed prominently in ancient archaeological sites such