had recently converted to Islam, were slaughtered in a single day, due to fears of an uprising. He also killed his own family members and nephews, in 1299–1300, after he suspected them of rebellion, by first gouging out their eyes and then beheading them. In 1308, Alauddin's lieutenant, Malik Kafur captured Warangal, overthrew the Hoysala Empire south of the Krishna River and raided Madurai in Tamil Nadu. He then looted the treasury in capitals and from the temples of south India. Among these loots was the Warangal loot that included one of the largest known diamond in human history, the Koh-i-Noor. Malik Kafur returned to Delhi in 1311, laden with loot and war booty from Deccan peninsula which he submitted to Alauddin Khalji. This made Malik Kafur, born in a Hindu family and who had converted to Islam before becoming Delhi Sultanate's army commander, a favorite of Alauddin Khalji. In 1311, Alauddin ordered a massacre of Mongols in the Delhi Sultanate wherein between 15,000 and 30,000 Mongol settlers, who had recently converted to Islam, were killed after Khalji suspected them of plotting an uprising against him. The last Khalji sultans Alauddin Khalji died in January 1316. Thereafter, the sultanate witnessed chaos, coup and succession of assassinations. Malik Kafur became the sultan but lacked support from the amirs and was killed within a few months. Over the next three years following Malik Kafur's death, another three sultans assumed power violently and/or were killed in coups. First, the amirs installed a six-year-old named Shihab-ud-din Omar as sultan and his teenage brother, Qutb ud din Mubarak Shah, as regent. Qutb killed his younger brother and appointed himself sultan; to win over the loyalty of the amirs and the Malik clan he offered Ghazi Malik the position of army commander in the Punjab. Others were given a choice between various offices and death. After ruling in his own name for less than four years, Mubarak Shah was murdered in 1320 by one of his generals, Khusraw Khan. Amirs persuaded Ghazi Malik, who was still army commander in the Punjab, to lead a coup. Ghazi Malik's forces marched on Delhi, captured Khusraw Khan, and beheaded him. Upon becoming sultan, Ghazi Malik renamed himself Ghiyath al-Din Tughluq, becoming the first ruler of the Tughluq dynasty. Economic policy and administration Alauddin Khalji changed the tax policies to strengthen his treasury to help pay the keep of his