An-Nasir Salah ad-Din Yusuf ibn Ayyub (Arabic: صلاح الدين يوسف بن أيوب‎ / ALA-LC: Ṣalāḥ ad-Dīn Yūsuf ibn Ayyūb; Kurdish: سەلاحەدینی ئەییووبی‎ / ALA-LC: Selahedînê Eyûbî), known as Salah ad-Din or Saladin (/ˈsælədɪn/; 1137 – 4 March 1193), was the first sultan of Egypt and Syria and the founder of the Ayyubid dynasty. A Sunni Muslim of Kurdish ethnicity, Saladin led the Muslim military campaign against the Crusader states in the Levant. At the height of his power, his sultanate included Egypt, Syria, Upper Mesopotamia, the Hejaz, Yemen and other parts of North Africa.

Originally sent to Fatimid Egypt in 1164 accompanying his uncle Shirkuh, a general of the Zengid army, on orders of their lord Nur ad-Din, an atabeg of the Seljuks, to consolidate Shawar amid his ongoing power struggle for vizier to the teenage Fatimid caliph al-Adid. With Shawar reinstated as vizier, he engaged in a power struggle with Shirkuh, which saw the former realigning himself with Crusader king Amalric. Saladin climbed the ranks of the Fatimid government by virtue of his military successes against Crusader assaults against its territory and his personal closeness to al-Adid. With Shawar assassinated in 1169 and Shirkuh's natural death later that year, al-Adid appointed Saladin vizier, a rare nomination of a Sunni Muslim to such an important position in the Isma'ili Shia caliphate. During his tenure as vizier, Saladin began to undermine the Fatimid establishment and, following al-Adid's death in 1171, he abolished the Fatimid Caliphate and realigned the country's allegiance with the Sunni, Baghdad-based Abbasid Caliphate.

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