Ahmad Sofian
Ahmad Sofian was a member of the Assassin Order and the father of Abbas Sofian. During the Siege of Masyaf in 1176, he was tasked with infiltrating the Saracen encampment. He was captured and forced to give up the name of the Assassin - Umar Ibn-La'Ahad - who had infiltrated Salah Al'din's personal tent, and killed a nobleman in his escape. Ahmad was nearly put to death until Umar stood up to take his place. After he was brought back into the fortress, Altaïr Ibn-La'Ahad blamed him for his father's death.
Some time later, in remorse over Umar's death, Ahmad entered to the home of Umar's ten-year-old son, Altaïr Ibn-La'Ahad, with tearful eyes begging to be forgiven before he committed suicide.
Abbas didn't know about this, and thought that his father was away and, that one day, he wouldl return. After sometime, Altaïr told Abbas the truth. But Abbas refused it and in a training session he attacked Altaïr for real.
At the last moment of Abbas' life, Altaïr again tried to make Abbas understand that he didn't lie to him about his father. But Abbas refused the truth again and, with his last breath, told Altaïr that he will see his father in the next life and will know the truth then, and when Altaïr time comes, they will find him and then there will be no doubts.