Passage 3.4.3
διατρίβοντος δὲ ἐν Αἰγίνῃ Κλεομένους Δημάρατος ὁ τῆς οἰκίας βασιλεὺς τῆς ἑτέρας διέβαλλεν αὐτὸν ἐς τῶν Λακεδαιμονίων τὸ πλῆθος· Κλεομένης δὲ ὡς ἀνέστρεψεν ἐξ Αἰγίνης, ἔπρασσεν ὅπως Δημάρατον παύσειε βασιλεύοντα, καὶ τήν τε ἐν Δελφοῖς πρόμαντιν ὠνήσατο, Λακεδαιμονίοις αὐτὴν ὁπόσα αὐτὸς ἐδίδασκεν ἐς Δημάρατον χρῆσαι, καὶ Λεωτυχίδην ἄνδρα τοῦ βασιλικοῦ γένους καὶ οἰκίας Δημαράτῳ τῆς αὐτῆς ἐπῆρεν ἀμφισβητεῖν ὑπὲρ τῆς ἀρχῆς.
While Cleomenes was spending time in Aegina, Demaratus, the king from the other royal house, began maligning him among the populace of the Lacedaemonians. When Cleomenes returned from Aegina, he sought to depose Demaratus from kingship, and he bribed the prophetess at Delphi to deliver oracles against Demaratus to the Lacedaemonians, precisely in accordance with his own instructions. He also encouraged Leotychidas, a man of royal lineage and belonging to the same house as Demaratus, to compete with him for the throne.