Amadeus was born into the wealthy and powerful gens (clan) Pok, which possessed large-scale landholdings in Győr County, but his parentage is unknown.

[4] Since the late 17th-century, some historiographical works and scholars (for instance, Márton Szentiványi and György Pray) incorrectly claimed that a certain George served as Bishop of Győr during the 1250–1260s.

In his letter, King Béla IV referred to his conflict and the tense relationship with Ottokar II of Bohemia, which caused the permanent hostile raids at the western boundaries between Hungary and Austria.

During the implementation of Béla's land reform in the first half of the 1250s, Amadeus frequently acted as co-judge in various lawsuits and border determinations in his diocese, alongside secular barons and his deputy, the archdeacon of Rábaköz.

[8] In June 1254, Amadeus filed a lawsuit against the burghers of Sopron over the property right of port duties in Fertőrákos at Lake Fertő (Neusiedl).

[11] It is plausible the cathedral was redesigned to Romanesque architectural style during his bishopric too,[12] according to 17th-century historian and prelate István Telekessy, but archaeological excavations and subsequent chronological studies do not confirm his hypothesis.

[14] Amadeus distanced himself in the conflict between Béla IV and his son Duke Stephen in the 1260s, and did not interfere in secular affairs nor hold dignity in the royal court.

Pope Urban, among others, instructed Amadeus to force Duke Stephen, even with ecclesiastical censure, to respect the property rights of his family members – primarily, Anna of Macsó and her sons – in the territory of his realm.