Medea

  In Greek mythology, Medea was the daughter of King Aeëtes of Colchis, niece of Circe, granddaughter of the sun god Helios, and later wife to the hero Jason, with whom she had two children, Mermeros and Pheres. In Euripides's play Medea, Jason leaves Medea when Creon, king of Corinth, offers him his daughter, Glauce. The play tells of Medea avenging her husband's betrayal by slaying their children. 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 "liminal" figures, poised on the threshold between the old world of shamans, chthonic earth deities, and the new Bronze Age Greek ways. Medea figures in the myth of Jason and the Argonauts, a myth known best from a late literary version worked up by Apollonius of Rhodes in the 3rd century BC and called the Argonautica. However, for all its self-consciousness and researched archaic vocabulary, the late epic was based on very old, scattered materials. Medea is known in most stories as an enchantress and is often depicted as being a priestess of the goddess Hecate or a witch. The myth of Jason and Medea is very old, originally written around the time Hesiod wrote the Theogony. 
[From Wikipedia]. 

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