The oldest of all the Puranas, the Matsya Purana, sets the story of the Matsya Avatar (fish incarnation) of Lord Vishnu, in the Western Ghats. The earliest Sanskrit text to mention Kerala by name as Cherapadah is the Aitareya Aranyaka, a late Vedic work on philosophy. It is also mentioned in both the Ramayana and the Mahabharata.