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In OTL, the Battle of the Milvian Bridge, which Constantine won, is said to have been the start of his conversion to christianity. But, suppose that he'd lost it. Lets say that he died, struck by a spear in contemporary accounts, or one of Jupiter's lightning bolts, in later legends (clearly, the contemporary accounts are the correct ones). As a result of his death, his army is routed, and Maxentius wins the day. What does later history look like, after this divergence?