Passage 7.1.5
τότε δὲ ἐπὶ τῆς Ἴωνος βασιλείας πολεμησάντων Ἀθηναίοις Ἐλευσινίων καὶ Ἀθηναίων Ἴωνα ἐπαγαγομένων ἐπὶ ἡγεμονίᾳ τοῦ πολέμου, τὸν μὲν ἐν τῇ Ἀττικῇ τὸ χρεὼν ἐπιλαμβάνει, καὶ Ἴωνος ἐν τῷ δήμῳ μνῆμα τῷ Ποταμίων ἐστίν· οἱ δὲ ἀπόγονοι τοῦ Ἴωνος τὸ Ἰώνων ἔσχον κράτος, ἐς ὃ ὑπʼ Ἀχαιῶν ἐξέπεσον καὶ αὐτοὶ καὶ ὁ δῆμος. τοῖς δὲ Ἀχαιοῖς τηνικαῦτα ὑπῆρξε καὶ αὐτοῖς ἐκ Λακεδαίμονος καὶ Ἄργους ὑπὸ Δωριέων ἐξεληλάσθαι·
At this time during the reign of Ion, when war erupted between the people of Eleusis and the Athenians, the Athenians summoned Ion himself to be their leader in the conflict. Fate overtook Ion while still in Attica, and his tomb is located within the deme Potamoi. The descendants of Ion ruled over the Ionians until such time as they and their people were expelled by the Achaeans. The Achaeans themselves had previously been driven from Lacedaemon and Argos by the Dorians.