There was lot of infighting after Alaud-din- Khilji's death and Mubarak Khan the third son of Alaud-din Khilji ascended the throne as Qutb-ud-din Mubarak in the year 1316 AD. The rule of Qutb-ud-din Mubarak was an utter failure. Ultimately he was murdered by Khusru Khan and Khilji Dynasty ended.
The sultanate suffered significantly from the sacking of Delhi in 1398 by Timur, He was a fourteenth century war lord of Turco-Mongol descent.