Who was the most ruthless Dictator Ever?

Yes, it was Chin. That's how the name China was formed. Of course then there was the religion of the Mayans and Aztecs who thought killing was a daily event like eating. They just loved to kill, and in the most inventive ways, like cutting out hearts, skinning people alive and then wearing their skins, throwing young children over cliffs or strangling them, all in the name of religion. And the then ball games where the losers were murdered. Rome had little on those guys. No wonder the Spanish were horrified.