Al-Nasir Kilij Arslan (also known as Kilij Arslan and Kiliç Arslan) was the Ayyubid emir of Hama from 1221 to 1229 (617AH-626AH). He was the son of al-Mansur Muhammad and the younger brother of al-Muzaffar Mahmud. The name Kilich Arslan (lion sword) was presumably homage to the Sultans of Rum, four of whom bore this name.
In 1219 al-Mansur called together the leading men of Hama and made them swear allegiance to his eldest son, al-Muzaffar Mahmud, as his heir apparent, before sending al-Muzaffar to Egypt to aid Sultan al-Kamil. Some time later he sent his second son, an-Nasir Kilij Arslan to join al-Mu'azzam in his campaigns in Palestine. However, as he lay dying, some of the leading emirs decided to invite an-Nasir back to Hama to usurp the throne in place of his brother, in the hope that they would be able to exercise real control under his nominal rule. Al-Mansur died in January 1221 (Dhu’l Qada 617), and an-Nasir duly installed himself as ruler in Hama. He was on campaign with al-Mu'azzam, emir of Damascus at the time of his father’s death, and al-Mu’azzam would only agree to release him to return to Hama if he promised to pay 40,000 dirhams once he had control of the city.
In Egypt, when al-Muzaffar learned of his father’s death, he obtained Sultan al-Kamil’s permission to go and claim his throne. On reaching Syria however he found his brother firmly established on the throne. None of the notables of Hama would support him in removing an-Nasir, and none of the other Ayyubid princes in Syria was interested in helping him, so he had to return to Egypt, where he was given an estate by al-Kamil. The two contenders for the throne of Hama were now aligned with the two major players whose rivalry divided the Ayyubid political world—al-Mu'azzam of Damascus and al-Kamil of Egypt. The rightful heir of Hama, al-Muzaffar, had the backing of al-Kamil, and Kilij Arslan looked to al-Mu’azzam for protection. Kilij Arslan managed to upset his backer however when he made overtures to a third leading Ayyubid emir, al-Ashraf, and failed to pay the 40,000 dirhams he had promised to al-Mu’azzam.