He set it there and set the other two Lingas, one each at Ettumannor and Kaduthuruthy.
Visiting these three temples on the same day is considered very auspicious.
Kara also established an idol for Lord Krishna on the North Western side of the temple.
Lord Shiva set a Deer to play here and this, which was an island was reclaimed by Parashurama when he wielded his Axe and created Kerala.
