Al Fadl (Arabic: ‎‎/ ALA-LC: Āl Faḍl) were an Arab tribe that dominated the Syrian Desert and steppe during the Middle Ages, and whose modern-day descendants largely live in southern Syria and eastern Lebanon. The Al Fadl's progenitor, Fadl ibn Rabi'ah, was a descendant of the Banu Tayy through his ancestor, Mufarrij al-Jarrah. The tribe rose to prominence by assisting the Burids and Zengids against the Crusaders. The Ayyubids often appointed them to the office of amir al-ʿarab, giving the Al Fadl emirs (princes or lords) command over the Bedouin tribes of northern Syria. Their function was often to serve as auxiliary troops.