Triptolemos

Triptolemus /ˌtrɪpˈtɒlᵻməs/ (Greek: Τριπτόλεμος, lit. "threefold warrior"; also known as Buzyges), in Greek mythology always connected with Demeter of the Eleusinian Mysteries, might be accounted the son of King Celeus of Eleusis in Attica, or, according to the Pseudo-Apollodorus (Bibliotheca I.V.2), the son of Gaia and Oceanus—another way of saying he was "primordial man".

While Demeter (in the guise of an old woman named Doso) was searching for her daughter Persephone, who had been abducted by Hades, she received a hospitable welcome from Celeus. He asked her to nurse Demophon—"killer of men", a counterpart to Triptolemus— and Triptolemus, his sons by Metanira. Demeter saw Triptolemus was sick and fed him her breast milk. Not only did he recover his strength but he instantly became an adult. As another gift to Celeus, in gratitude for his hospitality, Demeter secretly planned to make Demophon immortal by burning away his mortal spirit in the family hearth every night. She was unable to complete the ritual because Metanira walked in on her one night. Instead, Demeter chose to teach Triptolemus the art of agriculture and, from him, the rest of Greece learned to plant and reap crops. He flew across the land on a winged chariot while Demeter and Persephone, once restored to her mother, cared for him, and helped him complete his mission of educating the whole of Greece in the art of agriculture.

...
Wikipedia