Firoz Tughlaq was succeeded by his grandson who took up the title of Ghiyasuddin Tughlaq Shah II. Within a year of his accession he fell victim to intrigue and was beheaded in early 1389. For the next five years Sultans- Abu Bakr, Muhammad Shah and Alauddin Sikandar Shah ruled.
In 1390 Nasiruddin entered Delhi and enthroned himself. He was the last sultan of the dynasty and ruled from 1390-1412. During his reign Timur the Mongol leader of Central Asia invaded India. After plundering Delhi he returned to Samarkand. On his way back he plundered Firozabad, Kangra, Meerut and Jammu. Khizr Khan was appointed governor of Multan, Lahore and Dipalpur. Timur's invasion dealt a fatal blow to the Tughlaq dynasty and the Sultanate of Delhi. In 15th century the Sultanate completely disintegrated and numerous provincial kingdoms emerged in various parts of the country.