Of all Diocletian's tetrarchs Licinius was now the only survivor. His treachery soon compelled Constantine to make war on him. Pushing forward with his wonted impetuosity, the emperor struck him a decisive blow at Cibalae (8 October, 314). But Licinius was able to recover himself, and the battle fought between the two rivals at Castra Jarba (November, 314) left the two armies in such a position that both parties thought it best to make peace. For ten years the peace lasted, but when, about 322, Licinius, not content with openly professing paganism, began to persecute the Christians, while at the same time he treated with contempt Constantine's undoubted rights and privileges, the outbreak of war was certain, and Constantine gathered an army of 125,000 infantry and 10,000 cavalry, besides a fleet of 200 vessels to gain control of the Bosporus. Licinius, on the other hand, by leaving the eastern boundaries of the empire undefended succeeded in collecting an even more numerous army, made up of 150,000 infantry and 15,000 cavalry, while his fleet consisted of no fewer than 350 ships. The opposing armies met at Adrianople, 3 July, 324, and Constantine's well-disciplined troops defeated and put to flight the less disciplined forces of Licinius. Licinius strengthened the garrison ofByzantium so that an attack seemed likely to result in failure and the only hope of taking the fortress lay in a blockade and famine. This required the assistance of Constantine's fleet, but his opponent's ships barred the way. A sea fight at the entrance to the Dardanelles was indecisive, and Constantine's detachment retired to Elains, where it joined the bulk of his fleet. When the fleet of the Licinian admiral Abantus pursued on the following day, it was overtaken by a violent storm which destroyed 130 ships and 5000 men. Constantine crossed the Bosporus, leaving a sufficient corps to maintain the blockade ofByzantium, and overtook his opponent's main body at Chrysopolis, near Chalcedon. Again he inflicted on him a crushing defeat, killing 25,000 men and scattering the greater part of the remainder. Licinius with 30,000 men escaped to Nicomedia. But he now saw that further resistance was useless. He surrendered at discretion, and his noble-hearted conqueror spared his life. But when, in the following year (325), Licinius renewed his treacherous practices he was condemned to death by the Roman Senate and executed.
Henceforth, Constantine was sole master of the Roman Empire. Shortly after the defeat of Licinius, Constantine determined to makeConstantinople the future capital of the empire, and with his usual energy he took every measure to enlarge, strengthen, and beautify it. For the next ten years of his reign he devoted himself to promoting the moral, political, and economical welfare of his possessions and made dispositions for the future government of the empire. While he placed his nephews, Dalmatius and Hannibalianus in charge of lesser provinces, he designated his sons Constantius, Constantine, and Constans as the future rulers of the empire. Not long before his end, the hostile movement of the Persian king, Shâpûr, again summoned him into the field. When he was about to march against the enemy he was seized with an illness of which he died in May, 337, after receiving baptism.
Historical appreciation
Constantine can rightfully claim the title of Great, for he turned the history of the world into a new course and made Christianity, which until then had suffered bloody persecution, the religion of the State. It is true that the deeper reasons for this change are to be found in the religious movement of the time, but these reasons were hardly imperative, as the Christians formed only a small portion of the population, being a fifth part in the West and the half of the population in a large section of the East. Constantine's decision depended less on general conditions than on a personal act; his personality, therefore, deserves careful consideration.
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