The Gorgons (┌οργονς in Ancient Greek) were terrifying monsters that were turned into snake women by the goddess Athena after Medusa had an affair with Poseidon in her temple.
Contrary to popular belief, only Medusa could turn people into stone by looking into people's eyes. They were three monstrous sea spirits whose names were Stheno, Euryale, and the only mortal among the three, Medusa. Medusa was killed by Perseus by cutting off her head. Her head was later used by Perseus to kill the sea monster, Cetus. Zeus created his shield, Aegis, on oracular advise so he could win the war against the Titans. He defeated the gorgon Aex (or Aix), who was either the daughter of Helios (with a head as terrifying as her body was beautiful) or alternatively the son of Typhon and Echidna. He used the skin of a goat and fixed upon it the head of the gorgon Aex. It was said Zeus gave Aegis to his daughter Athena once the war was over.
Medusa and her two sisters, Stheno and Euryale, were turned into the three Gorgons by Athena. The transformation was a punishment; the human, Medusa, had been caught consorting with Poseidon in her temple. As Athena could not punish Poseidon, she punished Medusa. The result was a monstrous demon with slithering serpents as hair and a gaze that could turn a man to stone.
Medusa's sisters were turned into Gorgons as well for the act of assisting their sister into the goddess' sacred temple and because they were kind enough to share their sister's fate. It is said that Medusa created statues because her sisters faded away and she was left lonely. In some myths, the Gorgons were beautiful maidens with brass wings like angels.
It was said that Medusa was the youngest Gorgon among the three, as well as the most beautiful, which is the reason Poseidon noticed her. She is also the most famous. Medusa is also the only one with the power to turn her victims into stone, being the envy of Euryale. Her parents were Ceto and Phorcys. The Graiae are her other sisters besides Stheno and Euryale.
The immortal sister of Medusa. She has been known for bellowing cries. She had faded, along with the third sister but was revived by Gaea.
It was said that Euryale was the middle among the her sisters. In The Son of Neptune, it is revealed that like Medea, Midas and Lycaon, Stheno, and she are released from the Doors of Death and could reform within two hours. She is the smarter of the two.
The immortal sister of Medusa. She is remembered as the most vicious of the Gorgon sisters. She had faded with Euryale but was revived by Gaea. Stheno was said to be the eldest of her sisters.