أردشير الأول
Hasan I then himself invaded the domains of Kai Ka'us, and captured him. However, Hasan I chose to pardon Kai Ka'us. Hasan I later died in 1173, and was succeeded by his son Ardashir I. Ardashir I later took Kai Ka'us' domains, and ordered his general Mubariz al-Din Arjasf to attack Kai Ka'us. Sometime later, Kai Ka'us' son Justan died, and only his 1 year old grandson Zarrinkamar survived, whom Ardashir I agreed to raise and make ruler of the Paduspanid dynasty when the latter had grown up. Kai Ka'us shortly died in 1184. After his death, the nobles of the Paduspanid capital of Ruyan made his nephew Hazarasp II the new ruler of the dynasty.