The Beyşehir region corresponds to classical antiquity's Pisidia. At the location of the town itself there was in all likelihood a Greek city, which in one view was probably named Karallia, which was one of the two urban centers that surrounded the lake at the time, and in Roman times was known as Claudiocaesarea (Greek: Κλαυδιοκαισάρεια, Klaudiokaisareia), and Mistheia (Greek: Μίσθεια) in Byzantine times. Another theory is that Beyşehir's site corresponds to that of Casae (Κἀσαι), the seat of a Christian diocese of the Roman province of Pamphylia, which under Roman rule included large parts of Pisidia.[5][6] The names of some of its bishops are given in documents concerning church councils held from 381 to 879.[7][8] No longer a residential bishopric, Casae in Pamphylia is today listed by the Catholic Church as a titular see.[9]