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.
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