Bishop and Council Father
Hypatius governed the see of Gangra, the chief city of Paphlagonia in Asia Minor. His presence among the bishops gathered at Nicaea in 325 places him among the fathers of the First Ecumenical Council, which set forth the Creed against the Arian denial of the full divinity of the Son.
The Novatians, by whose followers he was later killed, were a rigorist sect that held that sins committed after baptism could not be forgiven; the accounts identify the woman who struck the fatal blow as an Arian.