Caligula was slang for "little boots". When he was a little boy, his mother the empress would dress Caligula up as a Centurian in a tiny uniform and he'd march and drill for the troops to their complete thrill. An adorable boy apparently before he started raping horses.
Winning hearts and minds.
What we had here was an army of 10's of thousands of trained killers who would march into hell because Agrippina manipulated the shit out of them years before their loyalty to this "boy" was necessary.
The long game.
6 year old Kathryn Janeway probably had horsey rides from most of the her father's friends who would one day be the Admiralty by the time she was given Voyager.