In 1312 a.d. Alauddin was at the zenith of his power and influence but after this his decline started. Too much absorption in wars and sensual life spoiled his health and he fell sick much before he had attained old age. His mental equilibrium was disturbed due to physical illness. He had become quite unstable.
The last days of Alauddin passed in disappointment and distress. His wife and sons did not care for him. His sickness went on increasing and soon it took a serious turn. Alauddin had made people of all sections his opponents due to his cruel policies.
Malik Kafur had come back from the South and knowing that the end of the Sultan was very near, he began to conspire against the lives of all those who could be a hindrance in his way to the throne of Delhi.
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First of all, Malik Kafur endeavoured to separate the Sultan from his kith and kin. He poisoned the ears of the weak and dying Sultan that his wife, eldest son Khizr Khan and brother-in-law Alp Khan were conspiriog against his life.
As a result, Alauddin ordered the imprisonment of his two sons, Khizr Khan and Shadi Khan in the fort of Gwalior. Alp Khan and one of his younger brothers, Nizamuddin, were beheaded and Malika-i-Jahan was made captive in the old fort of Delhi. It created havoc among the nobles and they left the Sultan all alone.
The soldiers of Alp Khan revolted in Gujarat and the Rajputs of Chittor turned out the royal forces. Har Pal, the successor of Singhana Deva, also revolted against the Muslim ruler and declared his independence. The laws of Alauddin began to be discarded and his system collapsed altogether.
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Alauddin Khalji was almost mad in anger at knowing all this. He began to bite his own flesh out of fury. His grief and anger aggravated his sickness and he breathed his last on 1 January 1316. a.d. Historians believe that his unprateful Naib, Malik Kafur, bad poisoned him after capturing all the powers.