Located on the eastern side of NH 47 at a distance of 18 km north of Trivandrum. The name of the temple seems to have emerged from the progenitor of the temple, Kalakkoth maharishi (sage). The temple is now being managed by the Travancore Devaswom Board. Archaeologists have assigned a date of 9th century to the sthanaka murti of Vishnu in the sub-shrine located in the north east corner of the campus.