Who were some Mongol leaders and just how
"Barbaric" were the Mongol?

The most well known is Genghis Khan
Others are Ögedei Khan, Aria Böke

The Mongols were murderers. They had brutal tactics but because of their civilized thinking, they were able to take over more land than any other civilization in history. Barbarians are not very bright and would have never been able to do that

Answergranulation;