The legendary hero known for his quest for the Golden Fleece is Jason. Jason, the leader of the Argonauts, embarked on a perilous journey to retrieve the fleece, which symbolized authority and kingship. His tale is rich with themes of adventure, betrayal, and the search for identity. Jason's quest showcases the significance of heroism in Greek mythology and his struggles against various challenges highlight the virtues of bravery and leadership essential for achieving lofty goals.