What is "triptolemus"

Triptolemus (, 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".