Rome, and that the emperor had promised to each convert a white garment and twenty pieces of gold, is at least in accordance with the spirit of that reign, though the fact itself, in all probability, is greatly exaggerated. Constantine came out with still greater decision, when, by his victory over his Eastern colleague and brother-in-law, Licinius, he became sole head of the whole Roman empire. To strengthen his position, Licinius had gradually placed himself at the head of the heathen party, still very numerous, and had vexed the Christians first with wanton ridicule, then with exclusion from civil and military office, with banishment, and in some instances perhaps even with bloody persecution. This gave the political strife for the monarchy between himself and Constantine the character also of a war of religions; and the defeat of Licinius in the battle of Adrianople, in July, 321, and at Chalcedon, in September, was a new triumph of the standard of the cross over the sacrifices of the gods; save that Constantine dishonored himself and his cause by the execution of Licinius and his son. The emperor now issued a general exhortation to his subjects to embrace the Christian religion, still leaving them, however, to their own free conviction. In the year 325, as patron of the church, he summoned the council of Nice, and himself attended it; banished the Arians, though he afterward recalled them; and, in his monarchical spirit of uniformity, showed great zeal for the settlement of all theological disputes, while he was blind to their deep significance. He first introduced the practice of subscription to the articles of a written creed and of the infliction of civil punishments for non-conformity. In the years 325-329, in connection with his mother, Helena, he erected magnificent churches on the sacred spots in Jerusalem.