This is the largest and the oldest Shiva temple located in the center of the town of Kumbakonam. The presiding deity of this temple is Lord Kumbeswara and the presiding Goddess is Sri Mangalambigai. There is a shrine dedicated to Adi Vinayaka (Lord Ganesh).
The great Mahamaham festival celebrated in honour of Lord attracts lakhs of people from far and wide and it takes place once in 12 years. It is celebrated on the conjunction of the moon with the Mahanakshatra and Jupiter crosses one Rasi or sign in about one year. It comes to Simha Rasi or Leo every 13th year and it is considered specially sacred. It is believed that on this auspicious day the tank receives supplies of water from the Ganges and eight other holy rivers and all the deities are said to remain present here on that occasion.
The Lord has a number of festivals round the year. Every year in the month of 'Maasi' (February-March) a festival is conducted and the image of Lord Kumbeswara is taken out in a procession. It is celebrated for 10 days during that period.
Kumbeswara Temple Others include, Theppam festival during Panguni (March - April), Sapthathanam during Chitirai month (April - May). During this festival Lord's idol will be carried in a palanquin to the nearby villages. Marriage festival for Lord Adikumbeswara and Goddess Mangalambigai is conducted in the month of 'Vaikasi' (May - June). Daily pujas are conducted six times from morning to evening.