Robert de Sable

One of the nine people Al Mualim wants Altair to assassinate, also the last of the nine to be assassinated.

Grand Master of the Knight's Templar. Robert follows a goal similar to the Assassins in that he is attempting to end the war in the Holy Land. Al Mualim has no objections against him ending the Crusade but more against the way Robert De Sable attempts to do so - the Assassins would have people find peace themselves, but the Templar would force their "peace" onto others and attempt to control them. Altair first encounters Robert De Sable at the beginning of the game in Solomon's Temple, where he has apparently discovered the Ark of the Covenant. However, this is later revealed to be another artifact known as the Piece of Eden, which the Templar wish to use to control the minds of the people, effectively controlling those who opposed the one who held the piece.

History's Robert De Sable

Born into a powerful family, Robert De Sable was immersed from birth into nobility. Though events during De Sable's life are difficult to pin down, at some point he became lord and ruler of Briollay, France. Subsequently, Robert De Sable entered into the order of Knights Templar and reigned as their "Grand Master" from 1191 to 1193. According to De Sable's entry on Wikipedia, "During the 3rd Crusade, they [De Sable and the Knights Templar] laid siege to the city of Acre, which soon fell. Throughout August 1191, they also recaptured many fortresses and cities along the Palestinian coast, which had been lost previously."