correct typo error
He participated in the First Ecumenical Council in Nicea in 325 and was among the first to preside during the council. He was prominent among the opponents of [[Arius]] and [[Arianism]] and zealously fought for the purity of of the Orthodox faith. He continued his battle against the Arians after the council. He refused to welcome any Arian [[priest]]s into his [[diocese]] and conducted a continuous literary attack on them, thus, incurring the hated of the Arians, including [[Eusebius of Caesarea]] and [[Eusebius of Nicomedia]].
In 331, his Arian opponents convinced him to convene a council in Antioch where his enemies, through use of suborned witnesses, accused
Eusebius of [[Sabellianism]] and adultery <ref>Philostorgoius, in Photius, "Epitome of the Ecclesiastical History of Philostorgoius". book 2, chapter 7.</ref>. Immediately the Arians [[deposition|deposed]] him without trial, in violation of the Apostolic Rule that accusations against the [[clergy]] must be substantiated by two witnesses. He was exiled to Trajanopolis in Thrace, even though the woman who accused him of adultery came forward and confessed her sin before the clergy and the people.
Although the people of Antioch, who loved and revered him, were indignant over his treatment, Eustathius restrained them and called on them to remain true to the Orthodox faith, as he was accompanied into exile by a large group of his loyal clergy.