What if an 18 year old Scipio (who would eventually become Scipio Africanus) was killed during the battle of Canne?
I just watched a documentary on the Punic Wars and it talked about Scipio escaping Canne with the skin of his teeth and thought "Huh, what if he didn't"?This might be a major underrated POD we have here.
I recall reading a Poul Anderson Time Patrol short story Delinda est, in which time travelers did just that (and killed his father as well). Major butterflies...