The vizier Shams al-Din al-Isfahani, seeking to defend a degree of Seljuk sovereignty in Anatolia from the Mongols, put Kayqubad on the throne together with his two elder brothers, Kaykaus II and Kilij Arslan IV.
•
He witnessed Bayju assembling his horsemen for the migration to Anatolia and sent messages advising his brothers to comply with the Mongol’s demands.
•
Kayqubad was buried somewhere in the wastes between Anatolia and Mongolia.