per sthalapurana, Shankara mangalatthammai, a pativratha used to
observe Ekadasi vratha and feed one Brahmachari(bachelor boy) on
Dwadasi. Tholakarana, a demon, created hurdles for this. The Lord
in the form of Brahmachari killed Tholakarana and came for the feast,
hiding the Yagnopavitham (sacred thread) with Krishnajinam (deer
skin). The Lord at the request of pativratha gives darshan and continues
to give this day , with Lakshmi adorning His chest and hence called
Thaayaar - Selvathirukozundhu Naachiyaar, Vaatsalyadevi.
Theertham - Kandaakarna Theertham, Pambaa river.