In 311 and edict of toleration was issued by the associated Emperor Galerius, and in 324 Constantine the Great, a friend and on his deathbed a baptised convert to Christianity, became sole ruler of the Roman world.

• 311年，联合统治的加利里斯皇帝颁布了容许信仰自由的法令； 324年，君士坦丁大帝成为罗马世界的惟一统治者，他支持基督教，临死前接受洗礼，皈依基督教。