25 Most Cruel Rulers In History

Genghis Khan

Genghis Khan, who not surprisingly was Timur’s hero, was a ruthless Mongolian warlord highly successful in his conquests. He ruled over one of the largest empires in history. Of course, that all came at a high cost. He was responsible for the deaths of 40 million people. His attacks may have reduced the world population by 11 percent.