Who Was Medusa in Greek Mythology?

In the earliest sources Medusa is simply one of three gorgon sisters, monstrous from birth, with the crucial detail that she alone was mortal while the other two were not. There is no origin story and no transformation.

She is described with snakes for hair, sometimes with tusks and wings, and the power to petrify with a look. Early Greek art shows her as a broad grotesque face rather than a beautiful one, used widely as a protective image on shields, buildings and pottery.

The version most people know comes much later, from the Roman poet Ovid writing around the beginning of the first century. In it Medusa was originally a beautiful mortal woman who was assaulted by Poseidon in Athena's temple.

Athena then transformed her into a monster. Whether this is presented as punishment or as something more ambiguous has been argued over for centuries, and it is this version that has driven modern reinterpretations of Medusa as a figure of injustice rather than simply a monster.

Perseus was sent to fetch Medusa's head, an errand designed to kill him. He succeeded with help from the gods, who supplied him with the equipment needed:

• •A polished shield used as a mirror, so he never met her gaze directly
• •Winged sandals for speed and escape
• •A cap of invisibility
• •A sword strong enough for the task

The head kept its power after death, which is the detail that makes the myth work as a story rather than ending it. Perseus used it as a weapon, turning enemies to stone, including a sea monster threatening Andromeda.

He eventually gave it to Athena, who set it on her shield. This closes a loop, since the gorgon face was already used as a protective emblem in real Greek practice long before the story was written down in this form.

Few mythological figures have been reworked as much. The image of a woman punished for something done to her, then made monstrous and finally decapitated by a hero, has been picked up by writers and artists as a symbol of blame and silencing.

It is worth being precise about what the sources actually say. The transformation story is Roman and late, not part of the earliest Greek material, and the earliest Medusa is a monster with no backstory. Both versions are real parts of the tradition, and knowing which one you are discussing avoids a lot of confusion.

When Perseus struck off Medusa's head, two figures sprang from her blood: the winged horse Pegasus and a warrior named Chrysaor. Both are described as her children by Poseidon.

Pegasus went on to appear in other myths, most notably carrying the hero Bellerophon against the Chimera before throwing him when he attempted to fly to Olympus. The detail matters because it makes Medusa the origin of one of Greek mythology's most enduring images, which sits oddly with her usual role as a monster to be destroyed and forgotten.

The oldest surviving written account comes from Hesiod's Theogony, a poem usually dated to around 700 BC. It names the three gorgons, Stheno, Euryale and Medusa, and notes that Medusa alone was mortal. Artistic evidence is just as important. A large stone gorgon carved on the pediment of a temple of Artemis on Corfu, from the early sixth century BC, shows her mid stride with a grinning face and protruding tongue, flanked by her children Pegasus and Chrysaor. Images like this tell historians how Greeks pictured her long before later poets retold the tale.

Art also shows the image changing over time. From around the fifth century BC, Greek artists increasingly gave Medusa a calm, even beautiful face, well before Ovid supplied her with a human backstory. Renaissance artists took up the theme with enthusiasm. Benvenuto Cellini's bronze statue in Florence shows Perseus holding the severed head aloft, and Caravaggio painted her screaming face on a real ceremonial shield. When you study Medusa, comparing images across the centuries is one of the clearest ways to watch a myth's meaning shift.

Ovid's version does more than give Medusa a backstory; it also turns her severed head into a source of new things in the world. As Perseus flew over the Libyan desert carrying the head, drops of blood fell to the sand and became the snakes that, the poem says, have infested the region ever since. Later, when he set the head down on a bed of seaweed while washing his hands, the plants hardened and turned red, and Ovid offers this as the origin of coral. These are origin stories in the classic mythological sense, explaining a feature of nature through a famous episode.

Her name has carried on into science and symbols. When naturalists described the free-swimming, bell-shaped stage in the life of a jellyfish, they called it a medusa, because the trailing tentacles recalled her writhing hair, and biologists still use the term to distinguish it from the fixed polyp stage. The flag of Sicily shows a gorgon's head at the centre of a three-legged symbol, a reminder that the protective gorgon face survived as an emblem long after the ancient world. Once you know the name, you start to notice how often she turns up in places that have nothing to do with heroes.

Medusa's blood did more than produce Pegasus and Chrysaor. In the mythological handbook known as the Library, traditionally attributed to Apollodorus, Athena gives some of the gorgon's blood to the healer Asclepius. Blood drawn from the veins on her left side was deadly, while blood from her right side could save life, and with it Asclepius was said to have raised the dead. That ability is one reason given for his downfall, since Zeus struck him with a thunderbolt for blurring the boundary between the living and the dead.

The playwright Euripides used the same idea in his tragedy Ion. There the Athenian queen Creusa owns two drops of gorgon's blood, handed down in her family from Erichthonius, who had received them from Athena: one drop kills, the other cures disease. A plot to poison a young man with the deadly drop fails when a dove drinks wine spilled on the ground and dies. The image of one substance that heals or harms depending on its use fits a Greek habit of thought; the word pharmakon meant both medicine and poison. It also fits Medusa herself, a destroyer whose face was used to protect.

The story of how Perseus came to hunt a gorgon begins on the island of Seriphos. Its king, Polydectes, wanted Perseus's mother Danae and saw her grown son as an obstacle. In the version preserved in the Library attributed to Apollodorus, the king announced that he was collecting gifts for a marriage to another woman, and the penniless Perseus boasted that he would not refuse even the gorgon's head. Polydectes took him at his word. The pattern is a familiar one in Greek myth: a hostile king sets a hero an impossible task, hoping it will quietly dispose of him.

Even reaching Medusa took a detour. Perseus first went to the Graeae, sisters of the gorgons, who were grey-haired from birth and shared a single eye and a single tooth among the three. He snatched the eye as they passed it from hand to hand and refused to return it until they told him the way to certain nymphs. The nymphs lent him the winged sandals, the cap of invisibility and a pouch called the kibisis to carry the head safely, and Hermes gave him a curved blade of adamant. Back on Seriphos, Perseus held up the head before Polydectes and his friends and turned them all to stone.

Medusa was originally simply a mortal gorgon whose gaze turned people to stone, and the widely known story of her transformation comes from a much later Roman retelling that has shaped almost every modern interpretation of her.