Passage 10.26.4
παρὰ τῷ Νέστορι Νεοπτόλεμος ἀπεκτονώς ἐστιν Ἔλασον, ὅστις δὴ ὁ Ἔλασος. οὗτος μὲν δὴ ὀλίγον ἐμπνέοντι ἔτι εἴκασται· Ἀστύνοον δέ, οὗ δὴ ἐποιήσατο καὶ Λέσχεως μνήμην, πεπτωκότα ἐς γόνυ ὁ Νεοπτόλεμος ξίφει παίει. Νεοπτόλεμον δὲ μόνον τοῦ Ἑλληνικοῦ φονεύοντα ἔτι τοὺς Τρῶας ἐποίησεν ὁ Πολύγνωτος, ὅτι ὑπὲρ τοῦ Νεοπτολέμου τὸν τάφον ἡ γραφὴ πᾶσα ἔμελλεν αὐτῷ γενήσεσθαι. τοῦ δὲ Ἀχιλλέως τῷ παιδὶ Ὅμηρος μὲν Νεοπτόλεμον ὄνομα ἐν ἁπάσῃ οἱ τίθεται τῇ ποιήσει· τὰ δὲ Κύπρια ἔπη φησὶν ὑπὸ Λυκομήδους μὲν Πύρρον, Νεοπτόλεμον δὲ ὄνομα ὑπὸ Φοίνικος αὐτῷ τεθῆναι, ὅτι Ἀχιλλεὺς ἡλικίᾳ ἔτι νέος πολεμεῖν ἤρξατο.
Near Nestor, Neoptolemus is depicted having slain Elasus, whoever this Elasus might be. He has been represented as still breathing slightly. Astynous, whom Lescheos also mentioned, is shown as fallen on his knees, Neoptolemus striking him with a sword. Polygnotus portrayed Neoptolemus alone among the Greeks still killing Trojans, since the entire painting was meant to be set above Neoptolemus’ tomb. As for Achilles' son, Homer throughout all his poetry gives him the name Neoptolemus; however, the Cypria states that he was called Pyrrhus by Lycomedes, and that he was named Neoptolemus by Phoenix, because Achilles had begun war when still young.