(ref: Tmolos’ta saklı kutsal bir kent Dioshieron, Hüseyin Üreten, Journal of International Social Research , Vol 9, Issue 44: 562-578) Dios Hieron (Ancient Greek: Διὸς Ἱερόν, meaning 'Sanctuary of Zeus') was a town of ancient Lydia, in the upper valley of the Cayster River.
[2] It also bore the name Diospolis (Διόσπολις),[3] and was cited by the sixth century Byzantine geographer Stephanus of Byzantium under that name.
[6][7] The Roman Era city had an ancient Christian bishop and is attested as an episcopal see from at least 451.
It was a suffragan of Ephesus, which it remained under until the late 12th century when it became a separate metropolis.
Today Dioshieron survives as titular see in the Roman Catholic Church,[8] so far the see has never been assigned.