 As a gift to Celeus, because of his hospitality, Demeter planned to make Demophon immortal by burning his mortal spirit away in the family hearth every night.She was unable to complete the ritual because Metaneira walked in on her one night and interfered with the process.Instead, Demeter chose to teach Triptolemus, the other son of Celeus (though he was ascribed different parentages as well), the art of agriculture and, from him, the rest of Greece learned to plant and reap crops.