Nasir al-Din's uncle Shams al-Din 'Ali ibn Mas'ud had been the first of the Mihrabanid maliks.
Nasir al-Din, meanwhile, asserted his own claim to the throne, attempting to gain Hulagu's support and sending his great-uncle Shuja' al-Din Nasr ibn Khalaf to take control of Sistan after the Kartid malik had departed.