What did Medusa do when she was mortal?

When Medusa was mortal, she was known as a beautiful maiden and served as a priestess in the temple of Athena. Her beauty attracted the attention of Poseidon, who pursued her, and they ultimately had an encounter in the temple. This act enraged Athena, who transformed Medusa into a Gorgon as punishment, making her hair turn to snakes and granting her the power to turn anyone who looked at her into stone.