As per legends it is believed that Sree Poornathrayeesa is the elder brother of the Goddesses of Eroor Pisharikovil Temple and Chottanikkara Temple. It is also believed that the Lord was married to a Namboothiri girl, Nangema, from Vadakkedathu Mana. During the annual temple festival occasions, deities from Perumthrikovil Temple (Lord Shiva) and Eroor Pisharikovil Temple (Lakshmi) visit here for their aaratu and a combined pooja and procession thereafter. This is locally called as Sankara-Narayana Vilakku (Shiva and Vishnu) and Laksmi-Narayana Vilakku (Goddess Lakshmi and Lord Vishnu). The Aarattu (the holy bath of the deity) of Sree Poornathrayeesa takes place at the temple pond of Chakkamkulangara Shiva Temple, which is situated north-east of the Sree Poornathrayeesa Temple.