Passage 9.4.2
γραφαὶ δέ εἰσιν ἐν τῷ ναῷ Πολυγνώτου μὲν Ὀδυσσεὺς τοὺς μνηστῆρας ἤδη κατειργασμένος, Ὀνασία δὲ Ἀδράστου καὶ Ἀργείων ἐπὶ Θήβας ἡ προτέρα στρατεία. αὗται μὲν δή εἰσιν ἐπὶ τοῦ προνάου τῶν τοίχων αἱ γραφαί, κεῖται δὲ τοῦ ἀγάλματος πρὸς τοῖς ποσὶν εἰκὼν Ἀριμνήστου· ὁ δὲ Ἀρίμνηστος ἔν τε τῇ πρὸς Μαρδόνιον μάχῃ καὶ ἔτι πρότερον ἐς Μαραθῶνα Πλαταιεῦσιν ἡγήσατο.
There are paintings within the temple: one by Polygnotus depicting Odysseus, who has already slain the suitors; another by Onasias showing Adrastus and the earlier expedition of the Argives against Thebes. These paintings are placed on the walls of the pronaos. At the feet of the statue lies the image of Arimnestus. Arimnestus commanded the Plataeans in both the battle against Mardonius and, earlier still, at Marathon.