I've always thought that perhaps the Battle of the Milvian Bridge had huge future implications because one bit of eventual fallout was the Christianizing of the Empire. The other one that always strikes me as huge, though it was the Eastern Empire, was Manzikert. World might be a very different place if the Byzantines had won rather than the Turks. No subsequent civil war, etc..
Absolutely. Constantine’s vision before the battle changed the course of the west for sure and Christianity itself. But in my own opinion, Constantine would have never existed if Hannibal had sacked Rome 600 years before the Goths sacked Rome.