Sultan Firoz Shah Tughlaq's death led to a war of succession coupled with nobles rebelling to set up independent states. His lenient attitude had strengthened the nobles, thus weakening the Sultan's position. His successor Ghiyas-ud-Din Tughlaq II could not control the slaves or the nobles. The army had become weak. Slowly the empire shrank in size. Ten years after his death, Timur's invasion devastated Delhi.