The Shield of Heracles is an archaic Greek epic poem that was attributed to Hesiod during antiquity. The subject of the poem is the expedition of Heracles and Iolaus against Cycnus, the son of Ares, who challenged Heracles to combat as Heracles was passing through Thessaly. It is generally dated from the end of the 7th to the middle of the 6th century BCE.

The Gorgons, in Greek mythology, are three monstrous sisters, Stheno, Euryale, and Medusa, said to be the daughters of Phorcys and Ceto. They lived near their sisters the Graeae, and were able to turn anyone who looked at them to stone. Euryale and Stheno were immortal, but Medusa was not and was slain by the hero Perseus.