The myths involving Jason have been interpreted as part of a class of myths that tell how the Hellenes of the distant heroic age, before the Trojan War, faced the challenges of the pre-Greek "Pelasgian" cultures of mainland Greece, the Aegean and Anatolia. Jason, Perseus, Theseus, and above all Heracles, are all figures on the threshold between the old world of shamans, earth deities, and the new Bronze Age Greek ways.