In Hindu epics, the demon king defeated by Rama is Ravana, the ten-headed ruler of Lanka. The conflict between them is central to the epic Ramayana, in which Ravana abducts Rama's wife, Sita. Rama, aided by his loyal companion Hanuman and an army of monkeys, ultimately defeats Ravana in a fierce battle, symbolizing the victory of good over evil. This narrative emphasizes the themes of dharma and righteousness in Hindu tradition.