Cestrus was a city in theRoman province ofIsauria, inAsia Minor. Its placing within Isauria is given byHierocles,Georgius Cyprius, and Parthey's (Notitiae episcopatuum).[1] While recognizing what the ancient sources said,Le Quien supposed that the town, whose site has not been identified, took its name from theRiver Cestros and was thus inPamphylia.[2] Following Lequien's hypothesis, the 19th-century annual publicationGerarchia cattolica identified the town with "Ak-Sou", which Sophrone Pétridès called an odd mistake, since this is the name of the River Cestros, not of a city.[1]
Bishop Epiphanius of Cestrus was present at theCouncil of Chalcedon in 451, and subscribed the joint letter of the bishops of Isauria to theemperorLeo I the Thracian in 458 concerning the killing ofProterius of Alexandria.[2][3][4] TheJacobiteMichael the Syrian reports that another, Elpidius, was a partisan ofSeverus of Antioch.[1]
No longer a residential bishopric, Cestrus is today listed by theCatholic Church as atitular see.[5]