E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Neoptolemos or Pyrrhos.
Son of Achilles; called Pyrrhos from his yellow hair, and Neoptolemos because he was a new solider, or one that came late to the siege of Troy. According to Virgil, it was this young man that slew the aged Priam. On his return home he was murdered by Orestes, at Delphi.