Abu Bakr, son of Firoz's second son took advantage of the situation, conspired against the Sultan and succeeded in dethroning him with the help of some dissatisfied nobles in 1389 A.D. but he was challenged by Prince Muhammad, who declared himself Sultan at Samana and with the support of a few power nobles attacked Delhi. Prince Muhammad captured Delhi in 1390 A.D. and assumed the title of Nasir- ud- din Muhammad Shah. He died after six weeks and was succeeded by his younger brother Nasir- ud- din Mahmud Shah who was the last ruler of his dynasty.
The rulers who followed Firoz were completely incompetent. The throne was contested by many princes of the family and the nobles and the governors freely participated in the question of succession. It reduced the honour of the Sultan and also led to the disintegration of the Empire. By the time Mahmud Shah ascended the throne, the Delhi Sultanate had practically lost everything like the entire south India, Khandesh, Bengal, Gujarat, Malwa, Rajasthan and Bundelkhand. The final blow on the Tughlaq Empire was the invasion of Timur.
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