According to the mythological records, it has been learnt that during the 16th century the present region of Panbari or Rangamati was a part of the Kamatpur kingdom which included certain regions of West Bengal, Assam and Meghalaya. The ruler during the concluding years of the 15th century, Nilambar was known to be a king with a violent character. His royal court included a man in the Manohar, who was Prime Minister Sachipatra's son and was comparatively young.