Saladin

From Assassin's Creed Wiki

Saladin (or Salah al-Din)(Arabic: صلاح الدين) Full name: Yusuf Salah al-Din Ibn Ayyub (Arabic: يوسف صلاح الدين بن أيوب), or simply Salah al-Din al-Ayyubi (Arabic: صلاح الدين الأيوبي)

[Note that "Salah al-Din" is one name, not a first name and surname]

Saladin is the commander of the Muslim armies and lands arrayed against the invading Richard the Lionhearted, and never makes a direct appearance in the game. He is, however, referenced frequently by other characters, and his forces are engaged with Richards during the battle of Arsuf.

Many people preach about Saladin in Jerusalem and Damascus. Oddly enough they all speak in the same gruff voice.