Thirumoolanathar Temple, situated in Ambasamudram in the Thirunelveli District of Tamil Nadu, is a renowned shrine dedicated to Lord Shiva, worshipped here as Thirumulanathaswamy. Referred to as Thiruchalaithurai in ancient scripts, this temple is one of the Muppeeda Shrines, along with Thirukoshtiyur Temple (Oorakaadu) and Thirumoola Nathar Temple (Vallanadu).
According to legend, Lord Brahma sought to escape the cycle of birth and death. When he approached Lord Shiva for assistance, he was instructed to perform a Yagna on the banks of the Thamirabarani River. Brahma, along with his consort Goddess Saraswathi, arrived at Aamalaka Vanam, a forest filled with gooseberry trees, and created two ponds, known as Brahma Theertham and Saraswathi Theertham. They bathed in these ponds and conducted the Yagna in honour of Lord Shiva. In response, Lord Shiva appeared as a Shiva Linga made of Vibhuti (sacred ash) alongside his consort Goddess Ulagammai, fulfilling the wishes of Brahma and Saraswathi.
The temple complex also features a separate shrine for Meenakshi and Chokkanathar, as well as a small shrine housing a tall idol of Lord Vishnu with his two consorts. Located in a picturesque setting amidst paddy fields, the east-facing temple is a serene and spiritual site.
In addition to the legend of Brahma and Saraswathi, it is said that the sage Agasthiar worshipped Lord Shiva at this site and was blessed with a vision of the divine wedding of Lord Shiva and Ulagammai. This further adds to the temple's spiritual significance and allure.