What were Constantine's failures?

Constantine was not known for having weaknesses. he was a good general who became ole emperor by winning two civil wars. He was adept at Propaganda. He was ruthless with his opposition. He had his son Crispus put to death and soon after he had his wife killed on the behest of his mother Helena. However, he was also a wise ruler. He tires to arbitrated disputes among rival Christian doctrines and he promoted the pagan cult of Dol Invictus (Undefeated Sun0 which had the potential of unite pagans in the empire.