In the year a.d. 381 Theodosius summoned the Bishops of his division of the Empire to meet in Council at Constantinople, in order to settle the disputes by which the Eastern Church had been so long distracted, and to secure the triumph of the Nicene Faith over the various forms of heresy which had arisen in the half-century which had elapsed since the first General Council.  Among the Bishops present were Cyril of Jerusalem, and his nephew Gelasius, who on the death of Valens had regained possession of the See of Cæsarea from the Arian intruder Euzoius.  Cyril is described by Sozomen H. E. vii. 7. as one of three recognised leaders of the orthodox party, and, according to Bishop Hefele Councils, ii. 344., as sharing the presidency with the Bishops of Alexandria and Antioch.  This latter point, however, is not clearly expressed in the statement of Sozomen.  Socrates writes that Cyril at this time recognised the doctrine of ὁμοούσιον, having retracted his former opinion:  and Sozomen says that he had at this period renounced the tenets of the Macedonians which he previously held Socrat. v. 8; Sozom. vii. 7..  Touttée rightly rejects these reproaches as unfounded:  they are certainly opposed to all his teaching in the Catechetical Lectures, where the doctrine of Christ’s unity of essence with the Father is fully and frequently asserted, though the term ὁμοούσιος is not used, and the co-equal Deity of the Holy Ghost is everywhere maintained.