Once, Saint Sushila cursed Sri Ragu Bagavan - Sun's Ascend Node, one of the nine-orbiting planets. To absolve his curse, Ragu worshipped Lord Siva in Kumbakonam Kilkottam in the first quarter of the night - First Jamam and Senbakaranyam in the Second quarter, and Thirupamburam in the Third quarter, and Nagaikaronam in the Fourth quarter and at last at Usha time came to this holy Senbaka forest and prayed to him to absolve his curse. So, we can see Sri Ragu Bagavan with his two consorts in his marriage
posture in the Southwest corner of this temple. Because of the serpent deity Ragu's worship, the Lord here also been called Naganathar, and this village Tirunageswaram