2. Genghis Khan
Probably one of the most famous Khans, Genghis was the Khan of the Mongolian Empire in the 13th century. It is inevitable to mention that he was also one of the most successful since he managed to conquer most of China and all the land through the Caspian Sea. However, he did not have mercy on his way, and it has been reported that he was able to kill around 700,000 people only in one battle. Generally speaking, he and his army killed around 20 to 60 million people overall.
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