Even then, there was a lot of diversity within the Christian church. There were debates about the nature of Jesus Christ relative to the Father, relative to the Holy Spirit. There were multiple sects of Christianity. And one in particular started to create a debate. There was a priest in Alexandria, which is one of the major cities of the Roman Empire. Now remember, by this point, Rome, of course, is one of the most significant, if not the most significant city. Now, Constantine sets up a capital at Byzantium, which will eventually be known as Constantinople.