Paul, having been refuted by Malchion, a Presbyter from the Sophists, was excommunicated
1 During his reign a final synod composed of a great many bishops was held, and the leader of heresy in Antioch was detected, and his false doctrine clearly shown before all, and he was excommunicated from the Catholic Church under heaven.
2. Malchion especially drew him out of his hiding-place and refuted him. He was a man learned in other respects, and principal of the sophist school of Grecian learning in Antioch; yet on account of the superior nobility of his faith in Christ he had been made a presbyter of that parish. This man, having conducted a discussion with him, which was taken down by stenographers and which we know is still extant, was alone able to detect the man who dissembled and deceived the others.
Source: Church History (New Advent)