Docimium, a titular see of Phrygia in Asia Minor. This city, as appears from its coins where the inhabitants are called Macedonians, must have been founded by Antigonos Dokimos. Its name is written Dokimeion, Dokimia Kome, Dokimaion, later Dokimion. It was famous for its marble-quarries, and is now identified with Istcha Kara Hissar, a village northeast of Afton Kara Hissar, in the vilayet of Brusa. On this site have been found many Christian inscriptions, later than Constantine. Docimium was a suffragan of Synnada in Phrygia Salutaris. Six or seven bishops are known, from 344 to 879 (Lequien, Or. Christ., I, 853); another bishop is mentioned in an inscription.