The reign of Diocletian (284-305) marks a new stage in the government of the empire. Recognizing that the empire and its military demands (created by fronts along the Rhine, Danube, and Tigris and Euphrates) presented too great a task for one man, Diocletian in 293 instituted his famous tetrarchy (rule of four). Bearing the title Augustus, he ruled the eastern part of the empire with the help of his assistant Galerius, who had the title Caesar; the Augustus in the western part of the empire was Maximian, and his Caesar was Constantius Chlorus. To reduce the danger of assassination and usurpations of imperial power, Diocletian also greatly increased the mystique of the emperor and made the principate's power and pomp more like that associated with Persian despots: People addressing the emperor first had to perform proskynesis , that is, lie down on the ground before the emperor and kiss the comer of his robe. Even members of the emperor's council and family had to stand in his presence. Dominus (lord) became the regular word of address to the emperor, who now wore a diadem and purple gown. The tetrarchy reestablished peace and stability, but the unity of the system suffered when Diocletian retired.
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Constantine (324-337), the son of Constantius Chlorus, became sole emperor in 324 and moved the capital of the empire to the Greek city Byzantium, which he later named after himself (Constantinople). His reason for moving the capital was strategic and only sensible, as Italy had for long been declining in the importance of the empire: The constant warfare shifted attention to the Rhine, Danube, and Tigris and Euphrates, far away from central Italy. Constantine, in fact, had been emperor for ten years before he visited Rome for the first time. In the Edict of Milan (313) he granted the Christians full religious freedom, and in 325, at the Council of Nicaea (from which came also Christianity's Nicene Creed), he made Christianity the official religion of the empire. His decision to have the empire embrace Christianity was based on a personal experience: Before the battle at the Milvian bridge (one of the battles that secured his position as emperor), he had seen a cross in the sky with the words, "In hoc signo vinces" (With this as your standard, you will conquer). Officially, Christianity faced no competition from other religions after 391, when the emperor Theodosius (379-395) banned all
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