Suleiman I (6 November 1494 – 6 September 1566) (voiced by Haaz Sleiman), also known as Suleiman the Magnificent and Suleiman the Lawgiver, was the tenth Sultan of the Ottoman Empire from 1520 until his death, widely regarded as one of the greatest Sultans in history due to his progressive attitude and the prosperity of the Empire during his reign. In the game, a seventeen-year-old Suleiman befriends Ezio shortly after the latter's arrival in Constantinople, and initially avoids telling him of his true identity by posing as a simple student. However, after Ezio saves Suleiman from a kidnapping attempt by the Templars, the latter enlists his help in investigating the feud between his father, Selim I, and uncle, Ahmet, over the claim to the Ottoman throne. This leads Ezio to uncover a Templar plot, headed by Ahmet (whom Suleiman had always supported over Selim), to restore the Byzantine Empire and use Isu artifacts to establish what the Templars view as "peace" by eradicating all differences between men. After discovering his uncle's betrayal, Suleiman, although shocked and not agreeing with the Templars' views, asks Ezio to spare Ahmet's life if he can. Suleiman also speaks with his father and, while unsuccessful in persuading him not to kill Ahmet, manages to convince him to spare Ezio and exile him from Constantinople instead. After succeeding Selim as Sultan years later, Suleiman would prove to be an important ally to the Assassins in their battle against the Templars.
