At the end of the tenth century Turks from Afghanistan began raiding India, a country of enormous wealth, ripe for conquest and incorporation into the Islamic world. In 1206 the Turks established the Sultanate of Delhi, which dominated the subcontinent for 300 years. The Sultans reached the height of their power in the reign of Muhammad bin Tughlak. His expansionist policies, which brought most of India under his control, reflected an uncontrollable and erratic ambition that eventually impoverished the country, and provoked a series of devastating revolts. He was famed for his learning, piety—and cruelty.
— MUHAMMAD BIN TUGHLUQ