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
Olba (ancient city) Olba (ancient city) Olba () was an ancient city and bishopric in the Roman province of Isauria, in present-day southern Turkey. It is included in the Catholic Church's list of Latin titular sees. Olba was a city of Cetis in Cilicia Aspera, later forming part of Isauria; it had a temple of Zeus, whose priests were once kings of the country, and became a Roman colony. Strabo (XIV, 5, 10) and Ptolemy (V, 8, 6) call it Olbasa. A coin of Diocæsarea, Olbos; Hierocles ("Synecdemus", 709), Olbe; Basil of Seleucia (Mirac. S.Theclæ, 2, 8) and the Greek "Notitiæ episcopatuum", Olba.