The primary conflict in the Assassin's Creed series is set between two opposing schools of thought that became separate orders. Although seeking a similar end, the Assassins and Templars have fought bitterly over the way to achieve that end throughout history. According to some, the Assassins and Templars once shared the same hopes and dreams for humanity, even the same ideals; though this has long been forgotten in the face the secret war the factions have fought against each other for millennia. While the Assassins seek to protect free will as the true expression of humanity's ability to improve itself, the Templars feel that the only way humans can achieve perfection is through the limitation of free will and the guidance of a firm hand. These differing ideologies have put the Assassins and Templars in direct opposition, causing them to wage a clandestine war against each other behind the backdrop of human history.