In Indian mythology, the demon king defeated by the god Rama is Ravana. Ravana is the primary antagonist of the epic, the Ramayana, where he kidnaps Rama's wife, Sita. Rama's battle against Ravana represents the struggle between good and evil. Ravana’s ten heads symbolize his immense power and knowledge, but ultimately, he is vanquished, reinforcing the triumph of dharma (righteousness) over adharma (evil).