Answer:
The answer is Constatine I I know this right because it litterally gives me a paragraph saying it on this essay dont know why the top answer only has a 3.0 some clowns purposely graded it bad
Step-by-step explanation:
The persecution of Christians continued for almost three hundred years until Emperor Constantine I issued an edict proclaiming Christianity as the official religion of the Roman Empire in A.D. 313. In 324, he summoned Christian leaders who developed the Nicene Creed, a belief statement that further strengthened the church. Constantine also set the date for celebrating Christ's birth as December 25th. By 325, the kingdom of Aksum, located in modern-day Ethiopia, also declared Christianity the official state religion.