In Greek lore, the monster slain by Perseus is the Gorgon Medusa. Medusa, cursed with a hideous appearance and the ability to turn others to stone with her gaze, posed a great threat to the world. Perseus, armed with divine gifts such as winged sandals and a reflective shield, defeated her and claimed her head as a powerful weapon. This myth emphasizes themes of heroism, courage, and the triumph of good over evil, showcasing the hero’s journey as a transformative experience.