Regarding the second Swamiyar, there are several versions as to where his illom is located - Thavanur, Kasaragod and other places have stated claims.
Thavanur : One version claims that Vilwamangalam is the same as "Vella" Illam of Thavanur (from "Thapanoor", the village of the "Thapaswi", the sainty).