Jovian died on the 17th of February, 364, and was succeeded by Valentinian, who in the following March gave over the Eastern provinces of the Empire to his brother Valens.  During the first two years of the new reign we hear nothing of Cyril:  but at the beginning of the year 366, on the death of his old enemy Acacius, Cyril assumed the right to nominate his successor in the See of Cæsarea, and appointed a certain Philumenus Epiphanius, Hær. 73, § 37..  Whether this assumption of authority was in accordance with the 7th Canon of Nicæa may be doubted:  Cyril’s choice of his nephew was, however, in after times abundantly justified by the conduct and character of Gelasius, who is described by Theodoret as a man “distinguished by the purity of his doctrine, and the sanctity of his life,” and is quoted by the same historian as “the admirable,” and “the blessed Gelasius Hist. Eccl. V. 8; Dialog. i. iii..”