Passage 3.6.8
ἐπαύσθη τε δὴ Λεωνίδας βασιλείας καὶ ἀντʼ αὐτοῦ Κλεόμβροτος ἔσχε τὴν τιμήν. εἰ μὲν δὴ ὁ Λεωνίδας ἐπέτρεψε τῷ θυμῷ καὶ Δημαράτῳ τῷ Ἀρίστωνος κατὰ ταὐτὰ ἀπεχώρησεν ἤτοι παρὰ τὸν ἐν Μακεδονίᾳ βασιλεύοντα ἢ τὸν Αἰγύπτιον, ὁ δὲ καὶ μεταγνόντων ἂν Σπαρτιατῶν ὤνατο οὐδέν· νῦν δὲ ἐπιβαλόντων οἱ φυγὴν τῶν πολιτῶν ἀφίκετο ἐς Ἀρκαδίαν, ἐκεῖθεν δὲ ἔτεσιν ὕστερον οὐ πολλοῖς κατάγουσί τε αὐτὸν Λακεδαιμόνιοι καὶ αὖθις βασιλέα ἐποιήσαντο.
Thus Leonidas was deprived of his kingship, and Cleombrotus held the office in his stead. Had Leonidas yielded to anger and departed in the same manner as Demaratus son of Ariston, going perhaps to the king in Macedonia or to Egypt, he would have received no benefit, even had the Spartans later regretted their decision. Instead, after being sentenced to exile by his fellow citizens, he traveled to Arcadia. A few years afterward, the Lacedaemonians recalled him home and reinstated him once more as king.