Quartigod son of Helen and Menelaus per the scholiast on Iliad 3.175, named as eponymous ancestor of the Persian Maraphioi — one of the noble Persian tribes Herodotus lists at 1.125. The Greek-heroic-age-to-Persian-aristocratic-tribe genealogy is exactly the kind of cross-tradition mythographic claim that propagates by being useful: connects the Achaemenid nobility to the Trojan-cycle pantheon through Helen's line. No narrative episodes; known only as a genealogical link.