- "All that is good in me, began with you, father."
- ―Darim to his father before leaving Masyaf.[src]
Darim was born in Masyaf in 1195, where he was raised by his parents, Altaïr Ibn-La'Ahad and Maria Thorpe.
Assassination of Genghis Khan
By 1217, Genghis Khan's Mongolian Empire had begun spreading rapidly from the east, and subsequently slowing the expansion of the Assassin Order. This caused Altaïr to believe that Genghis Khan held a Piece of Eden known as the Sword.
Convinced that they had to stop the Mongols, Darim and his parents immediately left Masyaf on a mission to assassinate Genghis Khan. His younger brother Sef remained in Masyaf to care for his wife and children. During their absence, Altaïr's right-hand man, Malik Al-Sayf, was placed in charge of the Order until their return.
In early 1227, the Assassins had reached Mongolia, where they met with one of the local Assassins, Qulan Gal. The Assassins formulated a plan, and Qulan Gal and Altaïr then infiltrated Genghis Khan's camp. However, due to his age, Altaïr had lost much of his stealth, causing him to be detected and severely injured by one of the guards. Qulan Gal managed to save his fellow Assassin, and helped him escape the camp. The Assassins were then forced to regroup and formulate a different strategy.
Realizing the threat to his life, Genghis Khan tried to flee on horseback. Qulan Gal, who had been expecting this, proceeded to shoot down the warlord's horse, while Darim subsequently shot Genghis Khan himself with his crossbow.
After ten years, the group had accomplished what they set out to do, and Darim and his parents finally started their journey home.
Exiled from Masyaf
Later in 1227, Darim and his parents returned to Masyaf, where they were greeted by a former Assassin apprentice named Swami. He informed them that the man who was supposed to greet them, Rauf, had died of fever during their absence. He also explained that Malik had been arrested by the new leader of the Order, Abbas Sofian, for unknown reasons.
Swami then told Darim that his brother Sef had retreated with his family to Alamut, at which point Altaïr urged Darim to retrieve his younger brother and return to Masyaf.
Some time after arriving in Alamut, Darim met with his sister-in-law and nieces. Darim later received a letter from his father, which revealed that his brother had been killed, and Darim hurried back to Masyaf.
He met up with his father in Masyaf village, where the two men fought off the attacking Assassins. Meanwhile, Altaïr informed Darim that his mother had been killed during Altaïr's confrontation with Abbas. They successfully escaped Masyaf, and Darim and Altaïr left for exile in Alamut.
Darim spent most of the next 20 years living with his father, sister-in-law, and nieces, until eventually his sister-in-law took her daughters to live in Alexandria. Later, Darim himself was driven away from Alamut by his father's state of depression, and his renewed obsession with the Apple of Eden. Darim departed to France, and later England to warn of the advancing threat of the Mongol Empire.
In 1247, Darim returned to Masyaf, following his father's return to power as leader of the Order. In 1257, Darim also traveled to Constantinople to invite the Venetian explorers Niccolò and Maffeo Polo to temporarily reside in Masyaf.
At the end of that same year, the Mongols attacked Masyaf. Darim was ordered by Altaïr to leave before the Mongols reached the fortress, and to take Altaïr's remaining books from his library with him.
As he said a final farewell to his father in front of the library doors, Darim realized that the library was in fact a vault, though his father did not reveal what it was supposed to contain. Bearing several of his father's books, Darim left Masyaf for Alexandria to rejoin his brother's widow and her children.