Passage 5.8.10
τῶν δὲ ὁπλιτῶν ὁ δρόμος ἐδοκιμάσθη μὲν ἐπὶ τῆς πέμπτης Ὀλυμπιάδος καὶ ἑξηκοστῆς, μελέτης ἐμοὶ δοκεῖν ἕνεκα τῆς ἐς τὰ πολεμικά· τοὺς δὲ δραμόντας ἀσπίσιν ὁμοῦ πρῶτος Δαμάρετος ἐκράτησεν Ἡραιεύς. δρόμος δὲ δύο ἵππων τελείων συνωρὶς κληθεῖσα τρίτῃ μὲν Ὀλυμπιάδι ἐτέθη πρὸς ταῖς ἐνενήκοντα, Εὐαγόρας δὲ ἐνίκησεν Ἠλεῖος. ἐνάτῃ δὲ ἤρεσεν Ὀλυμπιάδι καὶ ἐνενηκοστῇ καὶ πώλων ἅρμασιν ἀγωνίζεσθαι· Λακεδαιμόνιος δὲ Συβαριάδης τὸν στέφανον τῶν πώλων ἔσχε τοῦ ἅρματος.
The race of armored infantry (hoplitodromos) was first introduced at the sixty-fifth Olympiad, in my opinion as training for warfare. Damaretus of Heraea was the first victor in this race, in which the contestants ran with shields. The contest of chariots drawn by a pair of fully grown horses was instituted at the ninety-third Olympiad, and Evagoras of Elis was victorious in it. At the ninety-ninth Olympiad, a chariot race drawn by foals was also adopted, and Sybariades the Lacedaemonian won the crown with the chariot of foals.