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Constantine was the son of Constantius, who had served as a Caesar (a junior emperor) of the Western Roman Empire under Maximian before succeeding Maximian as Augustus (senior emperor) in 305. Constantius’ death in 306 sparked a conflict over who would succeed him. Though Constantine had the support of his father’s army, he allowed Severus, his father’s Caesar, to become Augustus. Maxentius, the son of Maximian, was angered that he was passed over and declared himself Augustus. He defeated the Severus and Galerius, the Augustus of the East, in 306 and 307. In 311, Maxentius declared war on Constantine, the greatest threat to his power. In the spring of 312, Constantine led his army toward Maxentius in in Rome. After routing Maxentius’ forces in northern Italy, Constantine approached Rome i...