Hercules is a demigod (half mortal and half god) who frees from his chains on the mountain, where he has been imprisoned by the tyrant God . In Roman mythology Hercules is the son of Jupiter and a mortal woman, Alcmene, and is a hero who performs many superhuman feats. It was common in epics and classical mythology for authors to include cameos by famous heroes in their stories; Shelley continues this tradition by including the famous figure of Hercules briefly in his narrative but expands very little on Hercules’s actions within the poem.