Explanation: After the death of Ghori there were many contenders for power. One was Qutb-uddin Aibak, who ascended the throne in Delhi with his father-in-law Yildiz remaining a threat to him for the next ten years.

The three important rulers of this dynasty are Qutb-ud-din Aibak, Iltutmish and Balban.

Source: Tamil Nadu NCERT