Rukn al-Din Mubarak Khwaja was a Qutlugkhanid ruler of Kerman and the son of Buraq Hajib, founder of the dynasty.
He did not return to Kirman upon hearing of his father's death but continued his journey, which eventually secured his recognition by Khan.
Indeed his deposed cousin Qutb al-Din Mohammad was held in Mongol court thanks to Chinqai's efforts.
He left his domains and set out to Luristan, first fleeing to his nephew Salghur shah - Atabeg of Yazd with his mother Uka Khatun in 1252, later getting into contact with Caliph al-Mustasim.
When Möngke heard of this treason thanks to the commander Buqa who ambushed, he authorised Qutb al-Din to execute his cousin.