The legendary hero associated with the quest for the Golden Fleece is Jason. He leads the band of heroes known as the Argonauts on a perilous journey to retrieve the fleece, which symbolizes authority and kingship. Jason's quest showcases themes of bravery, adventure, and betrayal, highlighting his complex character as both a leader and a flawed individual. His story is interwoven with love and loss, particularly in his relationship with Medea, who plays a crucial role in his success.