Joveini's brother was the powerful Shams al-Din, who had served as Minister of Finance under Hulagu and Abaqa Khan.
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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.
As such, he had significant support amongst the members of the Bashtini gentry and the military.