Princeps Bellum or Prince of War for Caligula. Like Caligula, it's a reference to his military background, but not as embarrassing for the guy. From a timeline where Caligula doesn't get the illness that either made him crazy or very crazy depending on who you ask, and lives at least close to his legendary father's legacy in terms of military conquests. Though as he was an ass to the senators and this doesn't seem to have been the result of his madness, there's still a good chance he'll be assassinated. Just put off for several years