Vishnumaya or Chattan is a non-Sanskritic deity that is popular among low-status castes in central Kerala
According to Hindu mythology Shiva while on a hunt happened to hear a sweet voice in the jungle. He was surprised to find that it belonged to a tribal girl, "Koolivaka" (Pronounced as Koolivaaka) - a girl of immense beauty. The solitude in that forest area called Koolivanam, and the wild beauty of the forest girl, made the Lord lustful. He informed Koolivaka of his wish and told her to wait for him until he returned from his hunt