First Council of Nicaea

The First Council of Nicaea (; ) was a council of Christian bishops convened in Nicaea in Bithynia by the Roman Emperor Constantine I in AD 325. This first ecumenical council was the first effort to attain consensus in the church through an assembly representing all of Christendom. It was presided over by Hosius of Corduba, a bishop from the West who followed the Pope who was the bishop of Rome and the Patriarch of the West.