Here was a man who wasn’t ashamed to be a Christian during a time when it was very unpopular. He went on to do many other great things for the Roman Empire. He ruled the West side of the empire. Rome was divided East and West during this time in history.
Constantine also organized the first Council of Nicene. This council is responsible for all the books of the bible coming (canonized) together under one umbrella. This council was called together to keep the church united in the doctrine of the Trinity. The council concluded that the Father, Son, and the Holy Spirt are one and the same. I’m glad that God called Constantine to be the one that call this council together to clear up what would have been a fight for future generations. The Nicene Council turned into other councils over the centuries. He is also responsible for building the church of the Holy Sepulchre. Here is what Wikipedia has to say about the Church of the Holy