Ananthan Kadu Sree Nagaraja Temple, a divine sanctuary, emerged from the celestial vision of Lord Sree Krishna bestowed upon Vilwamangalam Swamiyar, a venerable sage and devoted worshiper of Lord Mahavishnu. Within its sacred confines, Lord Sri Anantha, the foremost among the eight Serpent Gods, is revered as Naga Raja, the King of Serpents. Positioned within the Fort at Thiruvananthapuram, to the northwest of the renowned Sri Padmanabha Swami Temple, this temple is believed to be the birthplace of the latter. Vilwamangalam Swamiyar's journey to Ananthankadu, a dense forest, was spurred by a small mistake. This sage, deeply attuned to the vision of Krishnavathara, conducted elaborate Poojas every more morning. One day, a charming child appeared at his doorstep, helping. Enchanted by the child's presence, the sage assigned minor ritual tasks. However, as the child's playfulness disrupted the ceremonies, Swamiyar, in a moment of weakness, pushed the child away. The child vanished, leaving behind a message to find him in Ananthankadu.  Driven by grief, Swamiyar eventually reached Ananthapuri, where he encountered a poor farmer woman threatening to throw her crying child into Ananthankadu. Reacting swiftly, Swamiyar rushed to the scene, and there, the Supreme Lord manifested as Anantha Padmanabha. Overwhelmed, Vilwamangalam Swamiyar surrendered himself. In his earnest desire to offer Naivedya to the Lord, he found only a small, tender mango, which he placed in an empty coconut shell as an offering. In later years, the Maharaja of Travancore constructed two temples in the vicinity. The Chaitanya of Maha Vishnu was transferred to the Sree Padmanabha Swami Temple, while that of Anantha found its abode in the Ananthan Kadu Temple. The Padmanabha idol faces east, while the Anandhan idol faces west. Lord Anantha, the Serpent God, bestows bliss upon devotees, alleviating life's challenges such as wedding obstacles, Rahu's wrath, Kalasarpa Dosha, and skin diseases. Worshipping Lord Anantha is believed to bless the childless with children and fulfil the aspirations of those seeking Ashta Nagapreethi.