Amorium, also known as Amorion (Greek: Ἀμόριον), was a city in Phrygia, Asia Minor[1] which was founded in the Hellenistic period, flourished under the Byzantine Empire, and declined after the Arab sack of 838.

[2] 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.

[6] Its strategic location in central Asia Minor made the city a vital stronghold against the armies of the Umayyad Caliphate following the Muslim conquest of the Levant.

It capitulated to ‘Abd ar-Rahman ibn Khalid in 666 and was occupied by Yazid I in 669, then retaken by Constans II's general Andreas.

[2] Over the next two centuries, it remained a frequent target of Muslim raids (razzias) into Asia Minor, especially during the great sieges of 716 and 796.

[10][11][12] No longer a residential bishopric, Amorium is today listed by the Catholic Church as a titular see.

It was rediscovered by Richard Pococke in 1739, but the first visit by a western scholar was by the English geologist William Hamilton in 1836; subsequently, maps placed it more accurately.

In 2001, Ali Kaya made a geophysical survey of the church found in the upper city, although a full excavation has yet to be undertaken.

[17][failed verification] After more than 20 years of British led excavation at Amorium, fieldwork restarted in 2014 with a new Turkish team under the direction of Doçent Doktor Zeliha Demirel Gökalp of Anadolu University, based at Eskisehir.