I have often seen this moniker attached to Adolf Hitler but I don't believe it's quite true. He was a horribly evil man, but by no measure that I can find would I say he was the MOST evil. Stalin and Mao killed more people. Pol Pot killed a quarter of the population of Cambodia in only a few years, most on the basis of ethnicity. Romans crucified thousands and revelled in blood sports. 'Bloody' Mary burned hundreds at the stake on the basis of their religion. I think Hitler is the closest to home and most recent and that's why he's picked out. Who do you think is the Most Evil Person in History?