Phaedra

Phaedra (Ancient Greek: Φαίδρα) was a daughter of Minos and Pasiphae from Greek mythology. She was the wife of Theseus and was the mother of Demophon and Acamas by her.

Mythology
Phaedra was married to Theseus but she loved his son, Hippolytus. She tried to seduce Hippolytus but he rejected her. Angry at her rejection, Phaedra told Theseus that Hippolytus had raped her. He believed her accusation and cursed his son with one of the three curses that he was given by Poseidon, causing a sea monster to scare Hippolytus' horses and drag him to his death.

Another version of the myth states that Theseus killed Hippolytus and Phaedra killed herself out of guilt. Either way, Artemis eventually told Theseus the truth.