` :The only meaningful answer is in regard to the chronology internal to the myths. Since Medea later marries Aegeus, king of Athens and father of Theseus, this places the Argo voyage in the generation before the Trojan War. (5000 BC is the Neolithic period; locating the myth in historical time is not really very productive anyway.)    Related to this question of time: why is he called a ``late`` mythological hero in the article's first line? I am a Classics professor and teach Greek mythology for a living: I propose the word ``late`` be removed, since it doesn't convey anything either clear or apparently meaningful. True, the fuller extant versions of the Argonautica myth are later, post-Classical. But the Jason and Argo cycle are old.  `