What is "parthenopeus"

For the hero of mediaeval romance, see Partonopeus de Blois

In Greek mythology, Parthenopeus or Parthenopaeus (Παρθενοπαῖος) was one of the Seven Against Thebes, a native of Arcadia, described as young and outstandingly good-looking, but at the same time arrogant, ruthless and over-confident, although an unproblematic ally for the Argives.