Altiar Ibn-La'Ahad

Altaïr Ibn-La'Ahad (1165-1257) was a Syrian-born member of the Levantine Brotherhood of  Assassins and served as their  Mentor from 1191 until his death. He became an assassin at the age of 25 but was born into the order. He is a protagonist in Assassin's Creed. He was also a minor character in Assassin's Creed revelations. He is refrenced in most, if not all, main Assassin's Creed games.

Early Life
Altair was born to assassins,his mother was Maud and his father was Umar Ibn-La'ahad. Maud died giving birth. Umar was executed by the Sacrens at the first siege of Masyaf for killing a Sacren nobleman. Altair was angry with Ahmad Sofrian who had revealed Umar's name to the Sacrens. Ahmad came to Altair's room that night and committed suicide. Al Mualim, The assassin's Mentor, asked Altair not to tell anyone not even Abbas, Ahmad's son. Altair and Abbas became novices and good friends shortly after, due to both not having parents. Altair Eventually told Abbas the truth to try and console him, but instead, Abbas refused to talk with Altair until he asked their training instructor to let them fight with real swords. Abbas tried to kill Altair out of rage. Both of the assassins had to spend a month in the dungeon. When they were freed Abbas had to train for another year while Altair graduated to the rank of Assassin.

In 1189, Masyaf was attacked by templars. Abbas told Altair there was nothing they could do to save Al Mualim. Altair told Abbas to flank the templars and that he would save Al Mualim alone. Altair assassinated Haras, the double agent and rescued Al Mualim, earning Al Mualim's respect and earning Altair the title of Master Assassin.

Third Crusade
Altair, Malik, and Kadar were tasked with finding an artifact that would aid the assassins in the Jerusalem Vault beneath the remains of Solomon's Temple. While progressing through the catacombs, Altaïr broke the first tenet of the Assassin's Creed by killing an innocent man in their path. Malik admonished Altaïr for his recklessness, but Altaïr arrogantly dismissed him.

Upon seeing the archenemy of his Order, Robert de Sablé, Altaïr broke the second tenet of the Creed by confronting his enemy directly. Attempting to openly slay the Grand Master, Altaïr was easily thwarted and thrown from the temple, leaving Malik and Kadar alone with the Templars. Altaïr escaped from the temple and returned to Masyaf to report his failure to the Order.

When Altair told Al Mualim of his failure Malik came, his arm was crippled beyond repair. Malik told Al Mualim of how Altair broke every part of their creed. Al Mualim told Altair to defend Masyaf from Robert's men. Altair went with Rauf and leaped off a tower into haystacks behind a wall, making it seem like they killed themselves. The other assassin had an injured leg so Rauf stayed to help. Altair went to a tower using wooden planks to walk and cut a rope to release logs onto the soldiers.