Legend says this place mark the spot where Vibhishan, brother of Ravan- the demon king of Lanka, joined with Lord SriRam on Sri Ram’s search for his wife Sita.
Goddess Sita was kidnapped by Ravan and taken to Lanka. Vibhishan, the brother of Ravan, opposed this act of Ravan as it is unethical. He advised Ravan to return Sita to Rama. Ravan did not heed to his advice and ousted Vibhishan from his palace.
So Vibhishan came to this spot where Sri Ram was camping. He apologized to Sriram for his brother’s misdeed and offered to help him to get his wife Sita back.
The temple is about 15 kilometers from Rameswaram.