This place has been referred to in thevaram written by Saint Poet (7th Century AD) Thirugnana Sambanthar and Thirunavukkarasar.This temple is referred back to Ramayanam period when Lord Rama and Lakshmana are said to have worshipped Shiva here during their search for Sita, and acquired Rudramsam, to enable them to fight Ravana. Legend has it that the nine sacred rivers of India, prayed to Shiva at Banares (Viswanathar) to be absolved of the sins washed away by bathers, and were directed to bathe in the Mahamagam tank and worship Adi Kumbeswarar Temple. Viswanathar of Kaasi is believed to have manifested himself here at Kumbhakonam at Kudandaikkaronam.