Reign of Constantius II (22 mai 337 – 5 oct. 361)

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Born on 7 August 317, as the second surviving son of Constantine I, he inherited the eastern third of Roman Empire upon his father's death, sole Roman Emperor from 353, after the overthrow of the western usurper Magnentius. Constantius' reign saw military activity on all frontiers, and dissension between Arianism, favoured by the emperor, and the "Orthodox" supporters of the Nicene Creed. In his reign, Constantinople was accorded equal status to Rome, and the original Hagia Sophia was built. Constantius appointed Constantius Gallus and Julian as Caesares, and died on his way to confront Julian, who had risen up against him.