Siva religion flourished in ancient Lanka
Ravana, Mandodari and their parents were all devotees of Lord Shiva. Tradition says that they had worshipped at the three important shrines of Ketheeswaram (near Mannar), Koneshwaram (near Trincomalee) and Munneswaram (near Chilaw).
It is said that Mandodari’s father built the temple at Ketheeswaram, and Ravana’s mother aided the construction of Koneswaram. Rama is also reported to have worshipped at Munneswaram, and on his return to India, after crowning Vibhishna, Ravana’s brother, as King of Lanka, to have built the now famous Sivan temple at Rameswaram.
(This is a part of the excerpts of the speech of Mr. Ramachandra, the highly esteemed Editor of the internationally famous ‘Religious Digest’, who delivered this speech to sixty four Roman Catholic Nuns, belonging to different Orders, at the Aquinas University College, Colombo in 1971.)