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Qulan Gal
Qulan Gal was a male assassin living during Genghis Khan's invasions. It is highly possible that he is a son or grandson of Altaïr Ibn-La'Ahad, seeing as Altaïr left for Mongolia to train his sons to kill Genghis Khan, who he suspected was using a Piece of Eden. Finally, he was the one who killed Genghis Khan, who he killed with an arrow (in fact he hit his horse, indirectly "killing him" with a bow).
Trivia
The real Genghis Khan died in 1227 CE. The circumstances of his death are not certain. He could have been ill, killed in battle with Tanguts or fell off his horse.