The temple administration belonged to ten Brahmin families (ten illoms). These ten Brahmin families came from Neelamperoor village later settled in Vazhappally. Their temple administration lasted until the end of the 17th century. These are the ten Brahmin families are "Changazhimuttom, Kainikkara, Iravimangalom, Kunnithidasseri, Athrsseri, Kolancheri, Kizhangezhuthu, Kizhakkumbhagom, Kannancheri, Thalavana". The famous Copper scripts (Vazhappally Inscription) was recovered from one of this mattu "Thalavana Mutt". The main rituals in the Vazhappally temple were conducted by the monks of the Changazhimutttom Mutt.
Cheraman Perumal
Cheraman Perumal :Rajasekhara Varman (820-844 AD) was the second emperor of the Kulasekhara series. His story is recounted in the Chekkizhar Periyapuranam. It is believed that during his tenure, the steps were taken to renovate the Vazhappally temple. Rajasekhara Varma is said to have been the contemporary of Adi Shankaracharya, as he is mentioned in the Adi Shankaracharya and Shankaracharya victory of Madhavacharya. The oldest inscription received from Kerala is the Vazhappally inscription by Rajasekhara Varman (Cheraman Perumal) of Chera dynasty.[8]
Raja Chempakassery : In ancient times, the temple had 54,000 para paddy fields (Punja nilam). The soldiers of the Chembakassery Raja killed a Unni of the Changazhimuttam madom family at Venattukara in Kuttanad, who had gone there to gauge the "Pata Nelu" of Devaswom. The Brahmins of temple urazhma installed a brahma rakshas in the temple to satisfy the Brahma rakshas of Changazhimattum Unni. Additionally a hanging tree was erected in front of the Rakshas shrine and the statue of Raja of Chembakassery was hanged. But later, these forms were removed in the late 19th century. Chempakassery Raja offered pujas to the temple as a sign of repentance for killing Unni. Raja appointed the members of the Thiruvenkathapuram Warrior as the heirs of "Panthiradi Choru".
Vazhappally copper plate
Vazhapalli copper plate (c. 830 CE) - single plate with writing on both sides.
Vazhappally copper plate, dated to early 9th century AD, is the earliest available inscription in Malayalam language. It is a temple committee resolution in the presence of the Chera king of Kodungallur Rama "Rajasekhara" (9th century AD[9])[10][11] Rajasekhara is usually identified by scholars with Cheraman Perumal Nayanar, the venerated Shaiva (Nayanar) poet-musician.
The inscription (incomplete) is engraved in an old form of Malayalam in Vattezhuthu and Grantha scripts. It was inscribed in copper sheet and is an agreement between administrators of Vazhappally temple 18 citizens of a place and also describe the punishment if the temple rituals do not follow for Thiruvattuvai temple (Thiru Vazhappally Temple).