Passage 1.8.1
ἀπαιτεῖ δὲ ὁ λόγος δηλῶσαι καὶ τὰ ἐς Ἄτταλον ἔχοντα, ὅτι καὶ οὗτος τῶν ἐπωνύμων ἐστὶν Ἀθηναίοις. ἀνὴρ Μακεδὼν Δόκιμος ὄνομα, στρατηγὸς Ἀντιγόνου, Λυσιμάχῳ παραδοὺς ὕστερον αὑτὸν καὶ τὰ χρήματα, Φιλέταιρον Παφλαγόνα εἶχεν εὐνοῦχον. ὅσα μὲν δὴ Φιλεταίρῳ πεπραγμένα ἐς τὴν ἀπόστασίν ἐστι τὴν ἀπὸ Λυσιμάχου καὶ ὡς Σέλευκον ἐπηγάγετο, ἔσται μοι τῶν ἐς Λυσίμαχον παρενθήκη· ὁ δὲ Ἄτταλος Ἀττάλου μὲν παῖς ὤν, ἀδελφιδοῦς δὲ Φιλεταίρου, τὴν ἀρχὴν Εὐμένους παραδόντος ἔσχεν ἀνεψιοῦ. μέγιστον δέ ἐστίν οἱ τῶν ἔργων· Γαλάτας γὰρ ἐς τὴν γῆν, ἣν ἔτι καὶ νῦν ἔχουσιν, ἀναφυγεῖν ἠνάγκασεν ἀπὸ θαλάσσης.
The account requires also mentioning matters concerning Attalus, as he too is among those from whom the Athenians name their tribes. A Macedonian man named Docimus, a general of Antigonus, afterward surrendered himself and his possessions to Lysimachus, and he had in his service a eunuch, Philetaerus, a Paphlagonian by birth. The actions of Philetaerus regarding his rebellion against Lysimachus and how he brought Seleucus against him will be included in my excursus on Lysimachus. Attalus, son of Attalus and nephew of Philetaerus, obtained rule when the power was handed over to him by his cousin, Eumenes. Attalus's greatest achievement was that he forced the Gauls away from the coast into the land which they still possess today.