Vibhishana is the younger brother of Ravana, the King of Lanka, in the ancient Indian epic Ramayana, and one of the eight Chiranjivis. Though a rakshasa himself, Vibhishana turned his back on Ravana, and defected to Rama's side, owing to his dharma. After Rama defeated Ravana, the former crowned Prince Vibhishana as the King of Lanka before returning to Ayodhya. From Wikipedia
