The term Argonaut refers to a group of heroes in Greek mythology who sailed with Jason on the Argo in search of the Golden Fleece. Asterion was a Cretan bull-headed giant who was killed by Heracles. Idas was a prince of Messenia and a son of Aphareus who fought alongside Heracles in the Calydonian Boar Hunt. Heracles was a divine hero in Greek mythology, famous for his strength and courage. Jason was the leader of the Argonauts and the son of Aeson. Acastus was a king of Iolcus and the son of Pelias, who helped Jason in his quest for the Golden Fleece.