The Assassin Order, also known at various times as the Assassin Brotherhood,Liberalis Circulum (Circle of Liberals),it was an organized order of assassins and sworn enemies of the Templars, against whom they fought a continuous, recondite war, throughout the entirety of recorded history.
Whereas the Templars sought the power to save humanity from itself by controlling free will, the Assassin Order fought to ensure the survival of free will, as it allowed for the progression of new ideas and the growth of individuality.