The city of Aradus, as it was then called, became a Christian bishopric. Athanasius reports that, under Roman Emperor Constantine the Great, Cymatius, the Chalcedonian bishop of Aradus and also of Antaradus (whose names indicate that they were neighbouring towns facing each other) was driven out by the Arians. At the First Council of Constantinople in 381, Mocimus appears as bishop of Aradus. At the time of the Council of Ephesus (431), some sources speak of a Musaeus as bishop of Aradus and Antaradus, while others mention only Aradus or only Antaradus. Alexander was at the Council of Chalcedon in 451 as bishop of Antaradus, Paulus as bishop of Aradus, while, at a synod held at Antioch shortly before, Paulus took part as bishop of both Aradus and Antaradus.