Legend has it that the Saint Parashurama established 64 Gramams or sections after reclaiming Keralam from sea and Peruvanam Gramam is the 1st and most important among them. It is said that the temple was created by ‘Pooru Maharshi’, the son of the Hasthinapura King Yayathy after propitiating the Load Shiva with rigorous penance and the name of the place derived from the word “POORU VANAM”. Further it is believed that while transporting a beautiful, big Shivalinga received from a lake near Badarinath to this place, it happened to stuck in the branch of a tree and the present Madathilappan Temple has been constructed at this place. Shiva in dual linga form is the main feature of the temple and Lord is called “IRATTAYAPPAN” which denote the duality. The Sricovil of Madathilappan is considered to be the tallest Sricovil in South India. Four Sastha temples at Akmala, Kuthiran, Edathiruthy and Oozath are located on the boundaries of Peruvanam Gramam and Thiruvullakkavu Sastha Temple is located at the centre of the Gramam. Irattayappan is the ‘Gramadhipathi’ and Thiruvullakkavu Sastha is considered the ‘Gramaraskhakan’. Now the temple is under the joint administration of Cochin Devaswom Board and TravancoreDevaswom Board. There is a vast area of land and an office called ‘Cherikalam’ are existed near the south ‘Gopuram’ of this temple. It is important and rare that the Maharaja of Travancore had interest in this temple and therefore, the expenses for ‘Utcha Pooja’, ‘Prodhosha Nivedhyam’, ‘Nira Puthiri’, ‘Koothu’ are borne by him. It still continues.