Ancient Gangra (today’s Çankırı in Turkey) was the metropolitan see of the province of Paphlagonia in Asia Minor of the eastern Roman Empire. It is most notable for the synod of 13 bishops which convened here in the middle of the 4th century CE and the proclamation of 20 regulations (horoi: later designated as canons).

The primary concern of the council (Councils/Synods) was the new movement of Eustathius and his followers. In all likelihood, the Eustathius referred to here was …