Before Hitler, who was used in common speech/writing as the worst person to have ever lived?

by kelloggj

Hitler is commonly used as an insulting comparison for people being too authoritative or asshole-ish. Saying “don’t be a Hitler” or “calm down Hitler” are common enough to where he is regarded as one of if the not the worst person in history. Who took this mantle before him? Are there any historical examples of a separate person being used before Hitler took their place?

Georgy_K_Zhukov

More of course can be said, but this answer should be of interest for you.