Thirunagari (Nagapattinam) In Krita yuga Adi sesha the leader of the Nagas ( snakes ) did severe penance and propitiated Mahavishnu . Pleased with his tapas the Almighty appeared before him and declared that he will recline on him –Adisesha here after. He accepted Adi sesha as his Sayanam. Since Adi sesha worshipped Mahavishnu in Ashtanga Vidhana in agama sastras this place was named after him as Nagapattinam. Adisesha and His Consorts, are seen in the premises of the temple.
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During the churning of the milk ocean, Vasuki the serpent used as the rope for the purpose got exhausted and split its venom. Devas ran to Lord Shiva and Durga for protection from the impact of the spreading poison. Lord swallowed the poison and protected the world. Vasuki felt that it had caused Lord Shiva and Durga to swallow its poison and performed penance seeking Lord’s pardon. Lord gave darshan to Vasuki and admired its sense of sacrifice. Vasuki begged Lord Shiva to stay in the place. Lord obliged Vasuki and stayed here named after the serpent-Naga
Sri Neelayathatchi Amman Temple