Divine Manifestation & Kurma Avatar Legend (Kachabeswarar)
According to the ancient Thondaimandala Puranam, during the celestial event of Samudra Manthan (churning of the Ocean of Milk), the celestial Mandara Mountain began to sink into the deep waters. Lord Vishnu assumed the gigantic avatar of Kurma (the cosmic turtle) to support the mountain upon His shell. After the churning yielded the divine nectar (Amritham), Lord Vishnu felt immense physical heat, exhaustion, and pride from His colossal feat. To regain His divine tranquility and purify His form, Lord Vishnu descended to Thirukkachur, dug a sacred pool using His fins—known today as Koorma Theertham—and established a Shiva Lingam. Lord Vishnu performed rigorous penance (Tapas) worshipping Lord Shiva with bilva leaves and holy water. Pleased by Vishnu's devotion, Lord Shiva appeared, absorbed His fatigue, and granted Him cosmic peace. Since Lord Vishnu worshipped here in His Kachaba (turtle) form, the presiding Lord earned the divine name Sri Kachabeswarar (Kachabam = Turtle, Eswarar = Lord Shiva).
Sundarar's Feast Miracle & Virundheeswarar Legend
In the 8th Century CE, Saint Sundaramurthy Nayanar was traveling on foot from Thirukkazhukundram to Thirukkachur along with a large group of Nayanmar disciples. After walking under the intense afternoon sun, Sundarar reached Thirukkachur thoroughly exhausted, dehydrated, and famished. Unable to walk further, he sat under a shade-giving Banyan tree near the foot of the hill. Seeing the plight of His beloved devotee, Lord Shiva transformed Himself into an elderly Brahmin priest carrying a begging bowl (Bhiksha Patra). The Lord approached Sundarar and said, "Stay here and rest, my son; I shall bring you food." Lord Shiva then went door-to-door through every house in the village of Thirukkachur, begging for cooked rice, dhal, and curries. Collecting a vessel full of fresh, warm food, the Lord returned and lovingly served a royal feast (Virundhu) to Sundarar and his companions. When Sundarar completed his meal and turned around to express his gratitude, the old Brahmin vanished into the air. Realizing that it was Lord Shiva Himself who had begged for food to feed His devotee, Sundarar broke down in tears of ecstatic devotion and composed the famous Tevaram decad starting with "Mudhakkalazhundhi". Because the Lord served a feast (Virundhu) to His devotee, the hilltop deity is worshipped to this day as Sri Virundheeswarar.
Goddess Anjanakshi Amman & Irulneekki Ambal
The shrine of the Divine Mother at Thirukkachur is dedicated to Goddess Anjanakshi Amman. According to local priest traditions, the Goddess applies divine eye ointment (Anjana) to Her devotees, curing physical eye ailments, cataract, and spiritual blindness (Irul). Devotees who offer lotus flowers and ghee lamps to Goddess Anjanakshi are blessed with restored eyesight and inner clarity. She is also reverently called Irulneekki Ambal ("The Goddess who dispels darkness").