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In page Nephele:

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Phrixus and Helle were instructed to not look down to Earth for the duration of their flight.[citation needed] Helle, though, did look down, and fell off the ram into the Hellespont (which was named after her, meaning Sea of Helle) and drowned. Phrixus survived all the way to Colchis, where King Aeëtes took him in and treated him kindly, giving Phrixus his daughter, Chalciope, in marriage. In gratitude, Phrixus gave the king the Golden Fleece of the Golden Ram, which Aeëtes hung in a tree in his kingdom. The Golden Fleece would later be taken by Jason and his Argonauts.