Passage 3.16.9
μαρτύρια δέ μοι καὶ τάδε, τὴν ἐν Λακεδαίμονι Ὀρθίαν τὸ ἐκ τῶν βαρβάρων εἶναι ξόανον· τοῦτο μὲν γὰρ Ἀστράβακος καὶ Ἀλώπεκος οἱ Ἴρβου τοῦ Ἀμφισθένους τοῦ Ἀμφικλέους τοῦ Ἄγιδος τὸ ἄγαλμα εὑρόντες αὐτίκα παρεφρόνησαν· τοῦτο δὲ οἱ Λιμνᾶται Σπαρτιατῶν καὶ Κυνοσουρεῖς καὶ οἱ ἐκ Μεσόας τε καὶ Πιτάνης θύοντες τῇ Ἀρτέμιδι ἐς διαφοράν, ἀπὸ δὲ αὐτῆς καὶ ἐς φόνους προήχθησαν, ἀποθανόντων δὲ ἐπὶ τῷ βωμῷ πολλῶν νόσος ἔφθειρε τοὺς λοιπούς.
I have further evidence that the wooden image of Orthia at Sparta originated from the barbarians. Astrabacus and Alopecus, sons of Irbus, son of Amphisthenes, son of Amphicles, son of Agis, upon discovering this image, immediately lost their minds. Moreover, while sacrificing to Artemis, the Limnatians among the Spartans, together with the Cynosurians, and those from Mesoa and Pitane, fell into dissension; this strife escalated into killings. After many had perished at the altar, disease began destroying those who survived.