ELEUSIO. — Omean bishop of Cizicus, belonging to the clergy of Constantinople; in 356 he was consecrated bishop of Cizicus by Macedonius. Upon arriving in the diocese, he fought the Novatians, suppressing their sect. He took part in the Council of Ancyra in 358 and, the following year, in that of Seleucia, where he played an important role. Deposed at the Council of Constantinople in 360, under the accusation of having baptized and ordained a former priest of Hercules, he was driven into exile and replaced by Eunomius. But the latter was not accepted by the people, and E. was able to reassume the see through the amnesty of Julian the Apostate; he was expelled from it by the same emperor in 362.
He returned to his see upon Julian’s death, held a synod in 376, and took part in that of Antioch in Caria in 378. When the Macedonian controversy broke out, E. followed his teacher, maintaining that the Holy Spirit was a creature. Having gone to the Council of Constantinople in 381, he refused to subscribe to the faith of Nicaea and was therefore excluded from the sessions. In 383, together with other heterodox bishops, he was summoned to Constantinople by Theodosius, but remained obstinate in his theories. He was nevertheless able to return to Cizicus, where he died shortly afterward.