Medusa

In Greek mythology, Medusa (/mɪˈdjuːzə, -sə/; Ancient Greek: Μέδουσα, romanized: Médousa, lit. 'guardian, protectress'), also called Gorgo (Ancient Greek: Γοργώ) or the Gorgon, was one of the three Gorgons. Medusa is generally described as a woman with living snakes in place of hair; her appearance was so hideous that anyone who looked upon her was turned to stone. Medusa and her Gorgon sisters Euryale and Stheno were usually described as daughters of Phorcys and Ceto; of the three, only Medusa was mortal.

Medusa was beheaded by the Greek hero Perseus, who then used her head, which retained its ability to turn onlookers to stone, as a weapon until he gave it to the goddess Athena to place on her shield. In classical antiquity, the image of the head of Medusa appeared in the evil-averting device known as the Gorgoneion.

According to Hesiod and Aeschylus, she lived and died on Sarpedon, somewhere near Cisthene. The 2nd-century BC writer Dionysius Scytobrachion instead placed the Gorgons in modern-day Libya. Herodotus also associated the Gorgons with Libya, reporting traditions that located them there.

The three Gorgons—Medusa, Stheno, and Euryale—were described by Hesiod and Apollodorus as offspring of the sea-god Phorcys and his sister Ceto; according to Hyginus, however, their parents were "Gorgon" and Ceto. Their genealogy is shared with other sisters, the Graeae, as in Aeschylus's Prometheus Bound, which places both trios of sisters far off "on Kisthene's dreadful plain":

Near them their sisters three, the Gorgons, winged
With snakes for hair—hatred of mortal man

In most versions of the story, Medusa was beheaded by the hero Perseus, who was sent to fetch her head by King Polydectes of Seriphus because Polydectes wanted to marry Perseus's mother. The gods were well aware of this, and Perseus received help. He received a mirrored shield from Athena, sandals with gold wings from Hermes, a sword from Hephaestus and Hades's helm of invisibility. Since Medusa was the only one of the three Gorgons who was mortal, Perseus was able to slay her; he did so while looking at the reflection from the mirrored shield he received from Athena. During that time, Medusa was pregnant by Poseidon. When Perseus beheaded her, Pegasus, a winged horse, and Chrysaor, a giant wielding a golden sword, sprang from her body.

Jane Ellen Harrison argues that "her potency only begins when her head is severed, and that potency resides in the head; she is in a word a mask with a body later appended... the basis of the Gorgoneion is a cultus object, a ritual mask misunderstood." In the Odyssey xi, Homer does not specifically mention the Gorgon Medusa:

Lest for my daring Persephone the dread,
From Hades should send up an awful monster's grisly head.