Han Fei was a Chinese philosopher who lived during the late Warring States period. He promoted the political philosophy of Legalism, which became influential during the Qin Dynasty. Major Legalist principles included believing human nature is selfish, discouraging intellectualism, establishing law as the supreme authority over morality, requiring a strong and punishing ruler, and using war to strengthen the ruler's power. Legalism supported an authoritarian form of government with a powerful ruler maintaining control over subjects.