Kalyanasundaresar Temple or ThiruNallur temple is located 10 km from Kumbakonam,
Shiva is worshiped as Kalyansundaresar, and is represented by the lingam. His consort Parvati is depicted as Girisundari. The presiding deity is revered in the 7th century Tamil Saiva canonical work, the Tevaram, written by Tamil saint poets known as the nayanars and classified as Paadal Petra Sthalam. The legend of the temple is associated with sage Agastya and Amaraneethi Nayanar, one of the 63 nayanars, the Tamil Saiva saints. The lingam in the temple is believed to change colours five times during the day time.
The lingam in the temple changes colours five times during the day time.
From 6:00-8:24 a.m, it takes the colour of copper, light red from 8:25-10:48, molten gold from 10:49-15:12, unknown colour from 13:13-15:36 and emerald green from 15:37-18:00. The vilwa tree in the temple is believed to be the first of its kind in the planet and hence called “Aadhi tree”. Gananatha, a form of Shiva, in the form of balipeeta (platform for offering), is located in the temple. It is the only other place outside Varanasi, where Gananatha is found in the form