Explanation:

 Bakhtiyar Khilji, a member of the Khilji tribe, a Turkic tribe long settled in what is now southern Afghanistan,[7][8] was head of the military force that conquered parts of eastern India at the end of the 12th century and at the beginning of the 13th century. Khilji's subjugated Bihar in 1203. This effort earned him political clout in the court at Delhi. In the same year he took his forces into Bengal.