Military history of the Crusader states
The Seljuk–Crusader War began when the First Crusade wrested territory from the Seljuk Turks during the Siege of Nicaea in 1097 and lasted until 1128 when Zengi became atabeg of Aleppo. At the latter date, the chief threat to the Crusaders from the east and north became the Zengids. The conflict was generally fought between European Crusaders and the Seljuk Turks and their vassals. The Muslim Syrian emirates occasionally allied themselves with the Christians against rival states.
Altaïr Ibn-La'Ahad
The original "Assassin's Creed" takes place in 1191. During the Third Crusade, the Crusaders' armies clash with Saracens, fighting over control of the Holy City of Jerusalem. Altaïr is tasked by Al Mualim to find and retrieve a sacred object: The Chalice. It is said to have the power to unite under one flag all the factions of whatever side possesses it - in order to win the final battle. But the Chalice is too powerful an object to be left in the hands of men alone – it must be found and destroyed quickly. After learning that the Chalice is kept in Jerusalem, Altaïr manages to arrive before the Templar leader, Robert de Sable. There, he successfully rescues the Apple of Eden from a group of Templars. There it is revealed that the Chalice is a woman named Adha, whom Altaïr knew and had feelings for before the events of the game. From her, he learns that the Templars have paid off Harash, the second-in-command of the Assassins, to betray the Brotherhood. Altaïr then plans to attack Alep (the Assassin fortress), kill Harash, and run away with Adha, but after making his way through Harash's Assassin guards and killing him, Adha is kidnapped by Robert and taken to the Templars' port in Acre.