From Amazon.com:

An inventive reimagining of the story of Jason and the Argonauts, this novel by renowned poet and classicist Robert Graves brings heroic figures of Hellenistic myth to life. Graves’ Jason is belligerent, energetic, and full of life, and the society Graves builds for him is outlandish and deeply invested in ancient cults.

Against this primitive, religious backdrop, the charismatic Jason assembles a crew and sets out to retrieve the sacred gold-trimmed fleece that is sacred to Zeus, and that has been stolen by worshipers of the Triple Goddess. Accompanying him is Hercules, a brave warrior known more for his brawn, and his astonishingly good luck, than his brains. Robert Graves builds a compelling world that sets Hellenistic magic and mystery in a surprisingly gritty, realistic setting, a fascinating read for fans of Greek mythology.