The Khalji dynasty was of Turko-Afghan heritage. They were originally of Turkic origin. They had long been settled in present-day Afghanistan before proceeding to Delhi in India. The name "Khalji" refers to an Afghan town known as Qalati Khalji ("Fort of Ghilji"). They were treated by others as Afghan due to adoption of some Afghan habits and customs. The first ruler of the Khalji dynasty was Jalal ud-Din Firuz Khalji. He came to power after the Khalji revolution which marked the transfer of power from the monopoly of Turkic nobles to a heterogeneous Indo-Muslim nobility. The Khalji and Indo-Muslim faction had been strengthened by an ever-increasing number of converts, and took power through a series of assassinations. Muiz ud-Din Kaiqabad was assassinated and Jalal-ad din took power in a military coup. He was around 70 years old at the time of his ascension, and was known as a mild-mannered, humble and kind monarch to the general public. As a Sultan, he repulsed a Mongol invasion, and allowed many Mongols to settle in India after their conversion to Islam. He captured Mandawar and Jhain from the Chahamana king Hammira, although he was unable to capture the Chahamana capital Ranthambore.