Anastasius of Thessalonica was metropolitan bishop of Thessalonica (c. 431–452 CE) shortly after the Council of Ephesus of 431 CE, in which he participated. He maintained an important epistolary correspondence with Popes Sixtus III (432–440 CE) and Leo I (440–461 CE), which gives evidence of the ecclesiastical struggles over office and episcopal ordination in others jurisdictions. From the time of Pope Damasus, the metropolitan of Thessalonica was the vicar of the bishop of Rome with jurisdiction over the region of eastern Illyricum (this region was civill…