In Greek mythology, Mermerus (Ancient Greek: Μέρμερος, Mérmeros) and Pheres (Ancient Greek: Φέρης, Phéres) were the sons of Jason and Medea. They were killed either by the Corinthians[1] or by Medea,[2] for reasons that vary depending on the rendition. In one account, Mermerus was killed by a lioness while hunting.[3]