Passage 3.11.10
ἀνάκειται δὲ καὶ Δήμου τοῦ Σπαρτιατῶν ἀνδριὰς μεγέθει μέγας. καὶ Μοιρῶν Λακεδαιμονίοις ἐστὶν ἱερόν, Ὀρέστου δὲ τοῦ Ἀγαμέμνονος πρὸς αὐτῷ τάφος· κομισθέντα γὰρ ἐκ Τεγέας τοῦ Ὀρέστου τὰ ὀστᾶ κατὰ μαντείαν θάπτουσιν ἐνταῦθα. παρὰ δὲ τοῦ Ὀρέστου τὸν τάφον ἐστὶν εἰκὼν Πολυδώρου τοῦ Ἀλκαμένους, ὃν βασιλέων ἐς τοσοῦτο τιμῆς προήχασιν ὥστε οἱ τὰς ἀρχὰς ἔχοντες, ὁπόσα δεῖ σημαίνεσθαι, τοῦ Πολυδώρου σημαίνονται τῇ εἰκόνι.
There is also a statue of Demos of the Spartans, notably large in size. The Lacedaemonians also have a sanctuary dedicated to the Moirai (Fates), and near it lies the tomb of Orestes, son of Agamemnon; for, in accordance with an oracle, they brought the remains of Orestes from Tegea and buried them here. Beside the tomb of Orestes is a statue of Polydorus, son of Alcamenes, whom they have honored among their kings to such a high degree that the magistrates responsible for declaring public business make their announcements standing by the statue of Polydorus.