Final answer:
The hero associated with the Golden Fleece and Medea is Jason, a central figure in Greek mythology renowned for his quest with the Argonauts and his tragic relationship with the sorceress Medea.
Step-by-step explanation:
The hero associated with the Golden Fleece and Medea is Jason. Jason was a mythical Greek hero who is well known for leading the Argonauts in a quest for the Golden Fleece, and for his complex relationship with Medea – a sorceress he married and eventually deserted. This narrative is a cornerstone of Greek mythology, with Jason's exploits being among the most popular myths alongside the deeds of other heroes such as Hercules, Perseus, and Theseus.