The plot is set in a fictional history of real-world events, taking place primarily during the Third Crusade in the Holy Land in 1191. The player character is a modern-day man named Desmond Miles who, through a machine called the Animus, relives the genetic memories of his ancestor, Altaïr Ibn-La'Ahad. Through this plot device, details emerge about a millennia-old struggle between two factions: the Assassin Brotherhood (inspired by the real-life Order of Assassins), who fight to preserve peace and free will, and the Templar Order (inspired by the Knights Templar military order), who seek to establish peace through order and control. Both factions fight over powerful artifacts of mysterious origins known as Pieces of Eden to gain an advantage over each other. The 12th-century portion of the story follows Altaïr, an Assassin, who embarks on a quest to regain his honour after botching a mission to recover one such artifact from the Templars; he does so by finding and assassinating nine targets across the Holy Land.
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