Jalaluddin Firuz Khilji was the founder of the Khilji dynasty. He came to power after the overthrow of slave dynasty. Their ascendancy is known as Khilji imperialism because with the accession of Jalaluddin on the throne of Delhi, the supremacy of the Turks ended in India. He expanded the boundaries of his empire besides his achievements include suppression of the revolt of Malik Chhaju with the governor of Oudh. He suppressed the thuggees a band of robbers and send them off peacefully to Bengal. He adopted conciliatory policy towards the Mongols. He allowed some of the Mongols to settle in India.
It was during the conquest of Bhilsa that Alauddin the nephew of Jalaluddin started realising the dream of being sultan. In 1292 AD Alauddin led an expedition to Devagiri hearing of its wealth. Devagiri was forced to pay a huge war indemnity. This helped Alauddin in buying the nobles and pleasing the soldiers who were dissatisfied by the rule of Jalaluddin. Alauddin than hatched a conspiracy and got Sultan Jalaludin killed and proclaimed himself as the sultan.