Mermerus

In the Argonautic and post-Argonautic tradition Mermerus is presented as one of the two children of Jason and Medea (the other named Pheres). He appears in accounts of Jason and Medea’s household on return from Colchis and in the narratives of betrayal and violent aftermath surrounding Jason’s later marriage (sources summarised in modern reference works and mythographic compilations). Variant traditions record differing fates for this Mermerus — killed by Corinthians, killed by Medea as part of her revenge, or (in one account) killed by a lioness while hunting. Separately, a Mermerus is listed as a minor Trojan warrior slain in battle (his armor stripped by Antilochus). Later or local genealogical fragments sometimes insert a Mermerus into regional royal lines (a fragmentary note links a Mermerus as king of Thesprotian Ephyra and as transmitter of arrow-poison craft to a son Ilus), but those attestations are late and fragmentary.

Ancient sources supply no sustained physical description. In family accounts Mermerus is referred to as a young child (the paired children of Jason and Medea are named 'Mermerus and Pheres'); in an epic martial notice he appears as a slain warrior whose armor was taken by Antilochus. Beyond these situational references (child in household narratives; armored casualty in an epic list) no standardized iconography or detailed appearance is attested in the supplied materials.

Extant sources attribute no supernatural powers or special abilities to Mermerus; he is a human figure whose narrative role is genealogical and dramatic. His behaviors in the traditions are those of a son/child within the Jason–Medea household (a narrative victim in domestic tragedy) or, in the separate Trojan mention, a combatant killed in war. A late, fragmentary genealogical note suggests a Mermerus transmitted knowledge of making arrow poison to a son Ilus, but this is isolated and not corroborated in the main corpus.