The word Holi is derived from the demoness, Holika. She was the sister of Hiranya Kashipu, a demon king, who having defeated the Gods, proclaimed his supremacy over everyone else in the Universe. Hiranyakashipu's own son, Prahlada, was a devotee of Lord Vishnu. In spite of several threats from Hiranyakashipu, Prahlada continued offering prayers to Lord Vishnu. He was poisoned by Hiranyakashipu, but the poison turned to nectar in his mouth. He was ordered to be trampled by elephants yet remained unharmed. He was put in a room with hungry, poisonous snakes and survived. All of Hiranyakashipu's attempts to kill his son failed. Finally, he ordered young Prahlada to sit on a pyre in the lap of Holika, Hiranyakashipu's demoness sister, who also could not die because she had a boon preventing her from being burned by fire. Prahlada readily accepted his father's orders, and prayed to Lord Vishnu to keep him safe. When the fire started, everyone watched in amazement as Holika burnt to death, while Prahlada survived unharmed. The salvation of Prahlada and burning of Holika is celebrated as Holi. Thus Holi is celebrated to mark the triumph of good over evil, light over darkness, kindness over cruelty.