312—Constantine changed the whole character of the empire by embracing Christianity and relying largely on that element for the support of his power, while he disbanded the Pretorian, or royal Guard, which had for two hundred years assumed to make and unmake emperors, and whose example, imitated by the other armies, kept the world periodically disturbed by the disputes and battles of rival claimants to the imperial purple. By the 313—edict of Milan, Constantine abolished all laws unfriendly to Christianity; he restored the authority of the senate and magistrates, and removed his capital from Rome to Constantinople. 324—The pagan element was now so worn and decrepit that no general disorders resulted. Whatever was left rallied under Licinus, who was conquered by Constantine. It appears to have been the strength of the Christian element and its essential hostility to the Roman principle of violent subjugation that produced so many and fierce persecutions. Had it not been for the pressure of barbarians on the empire the prevalence of that system would have preserved society and the state for a thousand years more, as it actually did in the Eastern empire; but every thing that man has the management of must be affected by his limitations, his mistakes and his follies. Christianity needed a better ally, a fresher and purer society, built up by the young blood and better instincts of another and newer people. Constantine paid great respect to the clergy of the church and took a leading part in its general counsels—a great mistake and a great misfortune. 325—His spiritual supremacy was virtually acknowledged at the council of Nice which he convoked. 330—Constantine died leaving his vast dominions to his three sons, who, in the course of ten years, were reduced to one, Constantius. After a troubled reign of twenty 361—years more, he died, and was succeeded by his cousin Julian, called the “Apostate,” from his renouncing Christianity and laboring to restore the pagan religion. In this he signally failed. He undertook to rebuild the Jewish temple at Jerusalem, without success. 363—He was mortally wounded in an invasion of Persia, and was succeeded by Jovian, who restored imperial favor 364—to the Christian religion. He died after one years reign and Valentinian was elected emperor by the council of ministers and generals. He divided the empire with his brother, Valens, and afterward Rome and Constantinople usually had each an emperor. Valentinian died 375—and was succeeded by his son, Gratian.