Medusa was one of three sisters, the gorgons, but she was the only mortal one. Medusa was so beautiful that Poseidon was crazy about her, but she didn’t care about him; Poseidon turned her and her sisters into monsters with live snakes covering their heads. Medusa kept her beautiful face but everything else was so monstrous. And whoever dared to look into her face ended up being turned into stone.
Perseus thus had a hard task. He asked Athena and Hermes for help and two of them, together with the nymphs, provided winged sandals to fly him to the end of the world where gorgons lived, a cap that made him invisible, a sword and a mirrored shield. The latter was the most important tool Perseus had, since it allowed him to see a reflection of Medusa’s face and to avoid being turned into stone.
he cut Medusa’s head off, from the drops of her blood suddenly appeared two offspring: Pegasus, a winged horse, and Chrysaor, a giant or a winged boar. It’s believed that those two were Medusa’s children with Poseidon.
In any case, once he accomplished his task Perseus flew back and escaped Medusa’s sisters who tried to reach him. Later, Perseus used Medusa’s head as a weapon in many occasions until he gave the head to Athena to place it on her shield.