Stalin maybe, Hitler too; all variants on the theme of evil, so take your pick. But in terms of numbers, especially as a percentage of the world's population: first would be the Mongol invasion(s).
http://www.museumsyndicate.com/images/5/48012.jpg
Stalin maybe, Hitler too; all variants on the theme of evil, so take your pick. But in terms of numbers, especially as a percentage of the world's population: first would be the Mongol invasion(s).
http://www.museumsyndicate.com/images/5/48012.jpg