In Greek mythology, Mermeros and Pheres were the sons of Jason and Medea. They were killed either by the Corinthians or by Medea, for reasons that vary depending on the rendition (see Medea). In one account, Mermerus was killed by a lioness while hunting.
Namesakes
There were other characters in Greek mythology that bore the names Mermerus and Pheres:
References
Mermeros and Pheres Wikipedia(Text) CC BY-SA