a fleece of pure gold, kept at Colchis by King Aeëtes from whom it was stolen by Jason and the Argonauts with the help of Aeëtes's daughter, Medea.
British Dictionary definitions for Golden Fleece
Golden Fleece
noun
1.
(Greek myth) the fleece of a winged ram that rescued Phrixus and brought him to Colchis, where he sacrificed it to Zeus. Phrixus gave the fleece to King Aeëtes who kept it in a sacred grove, whence Jason and the Argonauts stole it with the help of Aeëtes' daughter See also Phrixus
Golden Fleece in Culture
Golden Fleece definition
In classical mythology, the pure gold fleece of a miraculous flying ram. Jason and the Argonauts made their voyage in quest of it. The fleece was kept in a kingdom on the Black Sea.