Iskender

Iskender was the Mentor of the Egyptian Assassins, and a descendant of Altaïr Ibn-La'Ahad.

His Assassins located one of the Memory seals in Alexandria, and with the help of the Ottoman Assassins were able to secure them before the Templars did

In 1511, he was arrested and detained in Alexandria, and to be put up for execution. He was rescued by Assassin apprentices from Constantinople, sent by Ezio Auditore da Firenze.

Source

 * Assassin's Creed: Revelations