Like did people compare others to Ivan the Terrible, Genghis Khan, Caligula, Nero, etc.? Was there any particular people who were clearly the most common choice to represent evil?
This question has come up enough to be found in the FAQ. You'll find linked there a thread I recommend with answers by u/Georgy_K_Zhukov and u/sunagainstgold and some follow-up back-and-forth worth reading in full.