 Seleucus is recorded being with Julian in Bithynia in c.353 and in 356, Libanius praises Seleucus of his eloquence in his Rhetoric.Although a Christian by birth, Seleucus became a zealous pagan of the ancient Greek religion who was a learned person.In November 361, Julian succeeded his paternal cousin Constantius II as Roman emperor and ruled as sole emperor until June 26, 363.