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Chagatai Khan died in 1242 and was succeeded by his grandson Qara Hülegü, whose father Mutukan had been killed in 1221 during the Siege of Bamyan. Qara Hülegü was too young to rule independently so the widowed khatun Ebuskun ruled as regent in his place. In 1246, Güyük Khan replaced him with one of his uncles, Yesü Möngke.