Genghis Khan is an undeniably known figure in Mongolian history but at the same time, a great deal isn't known about him. However, according to the Assassin's Creed timeline, we do know that Genghis was suspected of wielding the Pieces of Eden that led to his rise in power. We also know that the Mongol Empire that Khan created were major enemies of the Assassins.
Would that make the Mongol's Templars? Or just an outside force? Or just puppets? I think we need a game to find out.