Abd-ul-Aziz is said to have yielded the more readily as being desirous of bringing about a similar alteration in the succession in Turkey, in favour of his own eldest son, Prince Yussuf Izz-ed-din; public opinion was, however, opposed to so sweeping a change, and the succession to the throne in Turkey still goes to the eldest surviving member of the house of Osman.
Dying in 1245, the joint government of his three sons gave occasion to fresh inroads, till one of them died and Hulagu divided the empire between the other two, Izz ed-din (Kaikaus II.) ruling the districts west of the Halys, and Rukneddin (Kilij Arslan IV.) the eastern provinces (1259).
But Izz ed-din, intriguing with the Mameluke sultans of Egypt to expel his brother and gain his independence, was defeated by a Mongol army and obliged to flee to the imperial court.
Masud, the son of Izz ed-din, who on the death of his father had fled from the Crimea to the Mongol khan and had received from him the government of Sivas, Erzingan and Erzerum during the lifetime of Kaikhosrau III., ascended the Seljuk throne on the death of Kaikhosrau.
It is, however, only fair to add that the sultan was doubtless influenced by the desire to bring about a similar change in the succession to the Ottoman throne and to ensure the succession after him of his eldest son, Yussuf Izz-ed-din.
Six children survived him: Prince Yussuf Izz-ed-din, born 1857; Princess Saliha, wife of Kurd Ismail Pasha; Princess Nazime, wife of Khalid Pasha; Prince Abd-ul-Mejid, born 1869; Prince Seif-ed-din, born 1876; Princess Emine, wife of Mahommed Bey; Prince Shefket, born 1872, died 1899.
387; Izz al-Mulk Mahomined al-Musabbihi, d.