Tereus is a barbarian king who marries Procne—the daughter of an Athenian king who seeks to make peace with the barbarians. After marrying Procne, Tereus returns to Athens to retrieve Procne’s sister Philomela. As soon as Tereus sees Philomela, he lusts after her. Pretending to act as a devoted husband bringing his wife’s sister to visit his wife, he brings Philomela on his ship to his homeland. Once on land, he brutally rapes Philomela, cuts out her tongue, and rapes her two more times. He imprisons Philomela and returns to Procne, pretending as though nothing happened. Meanwhile, the two sisters manage to reunite, and they seek their revenge against Tereus by killing his son Itys and feeding him to Tereus at a banquet. After this episode, Tereus is turned into a monstrous bird with a long beak.