Kilij Arslan IV (Old Anatolian Turkish: قِلِج اَرسلان) or Rukn ad-Dīn Qilij Arslān ibn Kaykhusraw (Persian: رکن الدین قلیچ ارسلان بن کیخسرو) was twice the Seljuk Sultan of Rûm from 1249 to 1254 and later from 1257 to 1266.

However, a jarlig issued by Güyük Khan confirmed him as sultan over his elder brother, Kaykaus II in 1248.

[3] But this jarlig would quickly be worthless after Güyük's death in the same year.

The death of Isfahani's successor in 1254, Jalāl-al-Din Qaraṭāy, left a power vacuum which was filled by competition by supporters of the two brothers.

[4] In the 1260s, Mu'in al-Din Parwana redistributed Seljuk crown lands among his followers.