In Greek mythology, Tereus (/ˈtɛriəs, ˈtɪərjuːs/; Ancient Greek: Τηρεύς) was a Thracian king,[1][2] the son of Ares and the naiad Bistonis. He was the brother of Dryas. Tereus was the husband of the Athenian princess Procne and the father of Itys.