 During this period, he also asserted his authority over Ranthambore (1226) and Mandore (1227), whose Hindu chiefs had declared independence after Aibak's death.In 1228, Iltutmish invaded the Indus Valley region, defeated Qabacha, and annexed large parts of Punjab and Sindh to his empire.Subsequently, the Abbasid Caliph Al-Mustansir recognized Iltutmish's authority in India.