In Greco-Roman myth, the hero who defeats Medusa is Perseus. Armed with divine gifts, including a reflective shield from Athena and a sword from Hermes, Perseus successfully beheads the Gorgon, using cunning and bravery. This victory signifies the triumph of good over evil and the hero's journey of confronting daunting challenges. Perseus's slaying of Medusa also represents the transformative power of overcoming fears and obstacles, ultimately leading to greater strength and purpose in his own narrative.