What is "vibhishana"

Vibhishana IAST: or Bibhishan was a king of Lanka in the legendary epic Ramayana. He was the younger brother of the Rakshasa (demon) king Ravana of Lanka. Though a Rakshasa himself, Vibhishana was of a noble character and advised Ravana, who kidnapped and abducted Sita, to return her to her husband Rama in an orderly fashion and promptly. When his brother did not listen to his advice, Vibhishana joined Rama's army. Later, when Rama defeated Ravana, Rama crowned Vibhishana as the king of Lanka.

In some period of history Sinhala people have considered Vibhishana as one of the Four Heavenly Kings (satara varam deviyo). This belief was more prominent in the Kotte period. According to the Ravana Katha of Wickramasinghe Adigar, after the defeat of Ravana, Vibhishana transferred the Yaksha capital from Alakamandawa to Kelaniya. In the 15th century poem of Thotagamuwe Sri Rahula, the sælalihini sandesaya, the Myna is ordered to carry the missive to Vibhishana at his temple in Kelaniya. After the 16th century he was replaced as a God of the four warrants by the goddess Pattini . He continues to be worshipped by a diminishing number of adherents, mainly in the Kelaniya area.