Was the use of imperial nicknames in ancient Rome meant as an insult?

Who was the cruelest Roman emperor?

Roman Emperor Caligula

Q: Why is Roman Emperor Caligula remembered as the cruelest Emperor? Shortly into Emperor Caligula’s rule, he fell ill from what many suggest was syphilis. He never recovered mentally and became a ruthless, wanton killer of Roman citizens, including even his family.

What did emperor Caligula nickname mean?

Little Boots

Caligula wasn’t his real name.
Either affectionately or mockingly, Germanicus’ troops called the boy “Caligula,” meaning “Little Boots” or “Booties.” The nickname stuck, but Gaius reportedly hated it.

Who was the most perverted Roman emperor?

Caligula

1) Caligula had sex with his sisters and gave his horse a marble house. Caligula: not as bad as you think. But pretty bad. How he got power: Caligula is Rome’s most famously perverse emperor, in part due to popular portrayals that were fantastically salacious.