The mercury god temple. The temple was built by Aathidya Chola I. and Raja Raja Chola were ruler of this temple. Therefore, it is said that the oldest part of the temple is more than 3000 years old. Budha is a son of moon god, Budha deity resides over intelligent and person teaching capacities, he is detected Vedas in one hand and the sward in the other. His other two hands carry mace and shield he is riding upon a chariot or lion. There is a reference to this temple in Valmiki's Ramayana. Budha or Mercury is considered as the greatest among the wise. This Devata bestows wisdom and wealth on his devotees. He is ruled by Lord Maha Vishnu.
This temple is referred in 'Saiva Thirumurais' and 'Sastras'. This place is similar to Kasi with all the Snana Ghats. One can do all the KARMAs here, that is supposed to be done in kasi. He also grants power of expression and success in education. This is also known Aadhi Chidambaram Natraja dance here is known as Hasti Natanam. In this temple Agora Murthi is a main god, he is one of the furious incarnate of lord shiva. There was an Evil named "Padmasuran" in Thiruvengadu. He had a deep meditation on Lord Bhrama for power. Being satisfied on his meditation, Lord Bhrama offered him many powers. But he used those powers in a wrong ways.
He started to torture the saints and innocent peoples. Having nothing to do, all the saints and peoples requested Lord Shiva to put an end to his evil. As they asked, Lord Shiva took his incarnate 'Agora Murthi' and killed the 'Padmasuran' under a tree (which is now in Thiruvengadu temple, back to the entrance of Agora Murthi). All the peoples thanked Lord Shiva for saving them. There is a story Vedarishi, a Brahmin had placed his bundle of food in the hollow of a tree. A snake residing in the hollow, spewed poison on the food. Unaware of this, Vedarishi gave this food to a vedic priest, who died of the poison.
This Brahmin was absolved of his Brahmahathi Dosham(killed dosham) by worshipping Lord Siva of Thiruvengadu. Suwedaka on realizing that he was destined to die in his eighth year, reached Thiruvengadu and performed Siva pooja. As soon as he saw Yama, he held on to the Siva Linga tightly. Yama on seeing Thiruvengadar, ran away in fear and died. On the request of the Devas, the Lord brought Yama back to life. There is a separate sannithi for Budhan, the temple is quite large and all four important saivite saints have sung the price of this god.
Benefits of Worshipping:The person who come to visit thiruvengadu Budha Sthalam(Budh Sthalam) they will find relief from failure in business, set back in profession, lack of mental inability, nervous and skin problems, getting knowledge and education are the beneficial aspects of Budha. Thiruvengadu village is also famous for unique structure of pools in temples, this temple has three pools(Surya theertham, Chandra theertham, Agni theertham) and three gods it is believe that who takes the bath in all three pools, will be free from their problems like disease and delay of getting marriage, delay of getting child etc.,
Things of Worshipping:
Day : wednesday
Donation : Green Gram / moong Dhal, Green Cloth, Emerald
Homa/Havan : Wood From Chichidi Tree (Achyranthes Aspera)