Hiranyakashipu
In Hindu mythology, Hiranyakashipu was a powerful demon king who ruled the daityas. He was very angry when his brother Hiranyaksha was killed by Vishnu in his Varaha avatar. So he decided to become invincible by performing a penance to Brahma. Brahma granted Hiranyakashipu a boon that he could not be killed by any man, animal, or weapon. He also could not be killed inside or outside, during the day or night.