Victories over the Barbarians
Thus the emperor in all his actions honored God, the Controller of all things, and exercised an unwearied oversight over His churches. And God requited him, by subduing all barbarous nations under his feet, so that he was able everywhere to raise trophies over his enemies: and He proclaimed him as conqueror to all mankind, and made him a terror to his adversaries: not indeed that this was his natural character, since he was rather the meekest, and gentlest, and most benevolent of men.
Source: Life of Constantine (New Advent)