Assassin's Creed: Bloodlines takes place between the events of the original Assassin's Creed and Assassin's Creed II. The game is set on the island of Cyprus, taking the player to two of its cities, Limassol and Kyrenia. Altaïr has traveled to Cyprus from the Holy Land (the setting of the first game) in order to assassinate the last remnants of the Templars. Bloodlines includes more face time with Maria, the female Templar that was spared by Altaïr in Assassin's Creed. Altaïr captures Maria as a prisoner, but she escapes, before being captured again by Altaïr. In the novel Assassin's Creed: The Secret Crusade, Altaïr and Maria's relationship is more fully explored. They are married and have two sons: Darim and Sef.
IN Assassin's Creed: Revelations, Altaïr creates a massive library hidden beneath the Masyaf fortress that supposedly has information that can tilt the scales in the war between the Templars and the Assassins. Ezio discovers that the door to the library is sealed by five locks, and that five 'Masyaf keys' must be found in order to open the library. Whenever Ezio finds a Masyaf key, he inadvertently accesses one of Altaïr's memories - deliberately stored inside each key. As Ezio discovers more keys, the memories inside them are further along in Altaïr's life; for example, in the final key, there is a memory of Altaïr in his early 80s, returning to Masyaf to kill Abbas. When Ezio finally enters the Masyaf library, however, there are no books nor writings in the library. There is only the skeleton of Altaïr, holding the sixth Masyaf key, and the Apple of Eden on a pedestal at the back of the room. Ezio chooses to leave the apple, having "seen enough for one life".