He was also the great-grandson of the messenger god Hermes, through his mother's side. He was the son of Aeson, the rightful king of Iolcos. Iásōn ) was an ancient Greek mythological hero and leader of the Argonauts, whose quest for the Golden Fleece featured in Greek literature. Jason ( / ˈ dʒ eɪ s ən/ JAY-sən Greek: Ἰάσων, translit. Todd Armstrong (1963), Jason London (2000)Īeson (father) Aeolus (ancestor) Hermes (maternal great-grandfather) Argonautica by Apollonius of Rhodes (3rd century BC)