The Ecclesiastical History of Socrates Scholasticus

While the Emperor Constantius continued his residence at Antioch, Julian Cæsar engaged with an immense army of barbarians in the Gauls, and obtaining the victory over them, he became extremely popular among the soldiery and was proclaimed emperor by them. When this was made known, the Emperor Constantius was affected most painfully; he was therefore baptized by Euzoïus, and immediately prepared to undertake an expedition against Julian. On arriving at the frontiers of Cappadocia and Cilicia, his excessive agitation of mind produced apoplexy, which terminated his life at Mopsucrene, in the consulate of Taurus and Florentius, on the 3d of November. This was in the first year of the 285th Olympiad. Constantius had lived forty-five years, having reigned thirty-eight years; thirteen of which he was his father’s colleague in the empire, and after his father’s death for twenty-five years [sole emperor], the history of which latter period is contained in this book.