(c.250-336) Heresiarch, born Libya; died Constantinople. He quarreled with the Bishop of Alexandria over Christ's Divinity (see Arianism) in 325 his views were condemned at the Council of Nicrea, and he was banished. Supported by Eusebius of Nicomedia, a friend. of Emperor Constantine, he created constant troubles for Athanasius in Alexandria. Later he demanded that Alexander of Constantinople give him communion by the emperor's orders, but his sudden death prevented the sacrilege.