A reference to the legendary fleece of a golden ram from Greek mythology, or metaphorically, any highly sought-after prize or quest for wealth.
From Greek mythology: the Golden Fleece was the fleece of Chrysomallos, a golden ram. The term entered English through classical literature and became a metaphorical expression for an elusive goal or source of great wealth.
The quest for the Golden Fleece launched the legendary Argonauts on one of mythology's greatest adventures—it shows how ancient stories about treasure-hunting are basically the original adventure stories!
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