Passage 3.7.8
τοῦτον μὲν δὴ τῶν εἰρημένων μετάνοια ἔλαβεν ὕστερον· Δημάρατον δὲ βασιλεύοντα καὶ τά τε ἄλλα εὐδοκιμοῦντα ἐν Σπάρτῃ καὶ ἀπὸ τῶν Πεισιστρατιδῶν Κλεομένει συνελευθερώσαντα Ἀθηναίους ἥ τε Ἀρίστωνος ἀγνωμοσύνη καὶ τὸ ἔχθος τὸ Κλεομένους ἐποίησεν ἰδιώτην. καὶ τοῦ μὲν παρὰ βασιλέα Δαρεῖον ἐλθόντος ἐς Πέρσας ἐπὶ πολὺν ἐν τῇ Ἀσίᾳ χρόνον διαμεῖναι τοὺς ἀπογόνους φασί·
Indeed, this man previously mentioned experienced remorse afterwards. As for Demaratus, while ruling as king and gaining honor in Sparta in other matters as well, and having joined with Cleomenes to free the Athenians from the Peisistratids, it was the ill-temper of Ariston and the hostility of Cleomenes which reduced him to a private citizen. They say that, after he went to King Darius in Persia, his descendants remained in Asia for a long time.