It was the see of a Christianbishop.[6] Lequien, names only two known bishops of the town.[7] Constantius (fl 431[8] – 451[9]) and Evander[10] Another bishop, Gregorios, is attested in the first half of the 11th century. Diokleia was included in diocese lists until the 12th century.[11]: 234 No longer the seat of a residential bishop, it remains a titular see of the Roman Catholic Church[12] as well as the Eastern Orthodox Church (for which it is now a metropolitan titular see, with Kallistos Ware as its metropolitan until his death in August 2022).
Its site is located near Yeşilhisar in Asiatic Turkey.[1][13] This site is located on the southwest flank of the Ahır Dağ, 84 km south of Kütahya. The only remains of the ancient settlement are a few old inscriptions and a capital dated to the early Byzantine period. The old name "Diokleia" is preserved in the nearby place called Dolay, or Doğla, a short distance to the south.[11]: 233–4