The Delhi Sultanate and later Mughal Empire attracted Muslim refugees, nobles, technocrats, bureaucrats, soldiers, traders, scientists, architects, artisans, teachers, poets, artists, theologians and Sufis from the rest of the Muslim world and they migrated and settled in the South Asia. During the reign of Sultan Ghyasuddin Balban (1266–1286) thousands of Central Asian Muslims sought asylum including more than 15 sovereigns and their nobles due to the Mongol invasion of Khwarezmia and Eastern Iran. At the court of Sultan Iltemish in Delhi the first wave of these Muslim refugees escaping from the Central Asian genocide by the Mongol armies of Genghis Khan, brought administrators from Iran, painters from China, theologians from Samarkand, Nishapur and Bukhara, divines and saints from the rest of Muslim world, craftsmen and men and maidens from every region, notably doctors adept in Greek medicine and philosophers from everywhere.