Birgi is a neighbourhood in the municipality and district of Ödemiş, İzmir Province, Turkey.

In antiquity, the town was known as Dios Hieron (Greek: Διός Ἱερόν, 'Sanctuary of Zeus'),[5] one of two cities thus named.

[5] Ibn Battuta visited the city and attended a lecture by the eminent professor Muhyi al-Din.

[9] The Roman Era city had an ancient Christian Bishopric 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 bishopric in the Roman Catholic Church,[10] so far the see has never been assigned.