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
Battle of Ecbatana Battle of Ecbatana The Battle of Ecbatana was fought in 129 BC between the Seleucids led by Antiochus VII Sidetes and the Parthians led by Phraates II. Phraates II (ca. 139/138 BC - ca. 128 BC) faced the final attempt on the part of the Seleucids to regain their power in the east. The Seleucids amassed a large force of Greek mercenaries and led the army, totaling 80,000 soldiers, to confront the Parthians. After initial success, defeating the Parthians in two battles, Phraates sent a delegation to negotiate a peace agreement. However, the Parthians rejected the terms proposed by Antiochus.