The word Kashmir is an ancient Sanskrit word which literally means Land of Kashyap Rishi. Kashyap Rishi was a Saraswat Brahmin and one of the Saptarshis, who was key in formalizing the ancient Historical Vedic Religion. The Kashmiri Pandits are his descendants and have named the valley after him, in his honour. According to the "Nilmat Puran," the oldest book on Kashmir, in the Satisar, a former lake in the Kashmir Valley meaning "lake of the Goddess Sati," lived a demon called Jalodbhava (meaning "born of water"), who tortured and devoured the people, who lived near mountain slopes. Hearing the suffering of the people, Kashyap, a Saraswat Brahmin, came to the rescue of the people that lived there.