Passage 5.12.8
ἐν δὲ τῷ ἐν Ὀλυμπίᾳ ναῷ Νέρωνος ἀναθήματα τρεῖς μὲν ἐς κοτίνου φύλλα στέφανοι, τέταρτος δὲ ἐς δρυός ἐστι μεμιμημένος· κεῖνται δὲ αὐτόθι καὶ ἀσπίδες χαλκαῖ πέντε καὶ εἴκοσι, τοῖς ὁπλιτεύουσιν εἶναι φορήματα ἐς τὸν δρόμον. στῆλαι δὲ ἄλλαι τε ἑστήκασι καὶ ἡ πρὸς Ἀθηναίους καὶ Ἀργείους τε καὶ Μαντινέας ἔχουσα ὅρκον παρὰ Ἠλείων ἐς συμμαχίαν ἐτῶν ἑκατόν.
In the temple at Olympia there are offerings of Nero: three olive wreaths, while the fourth is a copy in oak leaves. There are also twenty-five bronze shields there, carried by soldiers for the armed race. Several stone inscriptions also stand there, among them one bearing the oath sworn by the Eleans to the Athenians, Argives, and Mantineans, establishing an alliance for a hundred years.