Hisarköy, colloquially called Hisar, is a neighbourhood of the town Davulga, Emirdağ District, Afyonkarahisar Province, Turkey. Its population is 35 (2021).
It is situated in the middle of the site of ancient and Byzantine Amorium. The village was founded in 1892 and spolia from Amorium were used to build it.
Amorium, also known as Amorion (Greek: Ἀμόριον), was a city in Phrygia, Asia Minor which was founded in the Hellenistic period, flourished under the Byzantine Empire, and declined after the Arab sack of 838. It was situated on the Byzantine military road from Constantinople to Cilicia. Its ruins and höyük ('mound, tumulus') are located under and around the modern village of Hisarköy, 13 kilometers east of the district center, Emirdağ, Afyonkarahisar Province, Turkey.
Arab/Islamic sources refer to the city as ʿAmmūriye (Arabic: عمورية). Under Ottoman rule the site, which never regained importance, was called Hergen Kale or Hergen Kaleh.