Due to the popularity of Krishna Karnamrita the author became a legendary figure, and every part, province of India claimed him for itself.
During an Utsavam in Ambalappuzha Sri Krishna Temple, Swamiyar found the missing god serving feast to the Maarars in the "Naatakasaala" (drama hall).
Even to this day, the Naatakasaala feast for Maarars is given much importance owing to the supposed divine presence.
On one of his sojourns, while approaching a forest area near Cherthala, the Swamiyar came face-to-face with seven divine women (angels).
On a very stormy night, he took off with a torch ("choottu", lighted bunched palm leaves) and somehow managed to cross the river using what appeared to be a log with a rope at one end.
Hearing about the trouble he had taken to visit her every night, she told him that he would have obtained Moksha, had he diverted all that energy and single-mindedness to pray to (please) God.
These words of his wife really shook him and there was a revelation in him, which led him to create his devotional masterpiece — Shree Krishna Karnamrutam, which he wrote under an assumed name "Leelasukan".
After reaching home and taking bath, he arranged for Punyaha to be performed on him, and soon thereafter he sought Sannyasa and became the "Vilwamangalathu Swamiyar".
Also in the vicinity on the north bank of Bharaathapuzha is Thirunavaya Navamukunda Temple apparently built for Swamiyar's mother to pray to Vishnu during her old age.
Even today, on the Vella Illam basement, "Yogeeswara Pooja" is performed in a grand way on the Sraadhham day (death anniversary) of the Swamiyar, adding to the belief that Vilwamangalam is here.
Ulloor S Parameswara Iyer suggests the original Sanskrit name would have been "Kodandamangalam" which translates to "Villumangalam" and changed to Vilwamangalam and hence to Vella.
Some believe that his "Poorvaasramam" (pre-sannyaasam home) was in Puthenchira, between Kodungallur and Mala in Mukundapuram Taluk of Thrissur district.
Claims that, on the way back from kaveri visit, the swamiyar came to the wild flat rocky area in the evening(where the temple and pond situated now).
Basavarajaiah, Chilamboli (1963) by G. K. Ramu, Bilwamangal (1976) by Gobinda Roy, Vilvamangal Ki Pratigya (1996) by Sanjay Virmani.