In Hellenic times it had a
mint,[3][4] under its king Elagabalus.[5]
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