Sthala Puranam
Mitrasaga, who lived in the Agaram Village, was a devotee of Lord Vishnu and he took it upon himself to spread the name of the Lord by enacting the Dasavatharam story through his dramas. Chandramalini, the daughter of a Kashmir king, was drawn by his artistic performance and fell in love with him.
She married Mitrasaga and came to stay with him in Agaram Village. Having enacted the Dasavatharam story several times through their plays, they wanted the real darshan of the Lord in that form.
One day after the morning bath at the Tamaraibarani Theertham, it is believed that Lord Vishnu appeared in an invisible form and chanted the Dwadasi Mantam – Om Namo Bhagavathey Vasudevaya.
Granted the prayers on this Dwadasi day in the Tamil calendar month of Maasi, Lord Vishnu is believed to have provided the Dasavathara darshan, all at the same time, at this place. Hence this place came to be known as Dasavathara Kshetram.
Chandramalini got Mukthi at this place- Lord Vishnu is believed to taken her in his Pushpaka Vimaanam.