Passage 3.21.1
προελθόντι δὲ αὐτόθεν σταδίους εἴκοσι τοῦ Εὐρώτα τὸ ῥεῦμα ἐγγυτάτω τῆς ὁδοῦ γίνεται, καὶ Λάδα μνῆμά ἐστιν ὠκύτητι ὑπερβαλομένου ποδῶν τοὺς ἐπʼ αὐτοῦ· καὶ δὴ καὶ Ὀλυμπίασιν ἐστεφανοῦτο δολίχῳ κρατῶν, δοκεῖν δέ μοι κάμνων αὐτίκα μετὰ τὴν νίκην ἐκομίζετο, καὶ συμβάσης ἐνταῦθά οἱ τελευτῆς ὁ τάφος ἐστὶν ὑπὲρ τὴν λεωφόρον. τὸν δὲ ὁμώνυμον τούτῳ, νίκην καὶ αὐτὸν Ὀλυμπίασι, πλὴν οὐ δολίχου, σταδίου δὲ ἀνελόμενον, Ἀχαιὸν ἐξ Αἰγίου φησὶν εἶναι καὶ τὰ ἐς τοὺς Ὀλυμπιονίκας Ἠλείων γράμματα.
After advancing from there about twenty stades, the current of the Eurotas approaches closest to the road, and there is the memorial of Ladas, who surpassed in swiftness of foot all rivals of his time. Indeed, he was crowned victor at Olympia in the dolichos race. My own view is that he fell ill immediately after his victory and was carried back, and his death occurring here, the tomb stands by the road. There is another Olympic victor with the same name, who won not in the dolichos but in the stadion; according to the records of the Eleans concerning Olympic victors, he was an Achaean from Aegium.