1227, August 15 - 31
Genghis Khan, (actually named Borjigin Temujin), the founder and Great Khan of the Mongol Empire, dies in Mongolia some time in late August. 1227. At the time of his death, the Mongol Empire was 2.5 times larger by territory than the Roman Empire.
A study published in 2003 in The American Journal of Human Genetics suggested that Genghis Khan DNA can be found in one in 200 men today. The cause of his death is shrouded in mystery and it is now believed that it was caused by the bubonic plague.