§2.13.1ὡς δὲ κατεσκευάσατο καὶ τὸ βουλευτικὸν τῶν γερόντων συνέδριον ἐκ τῶν ἑκατὸν ἀνδρῶν, ὁρῶν ὅπερ εἰκὸς ὅτι καὶ νεότητος αὐτῷ δεήσει τινὸς συντεταγμένης, ᾗ χρήσεται φυλακῆς ἕνεκα τοῦ σώματος καὶ πρὸς τὰ κατεπείγοντα τῶν ἔργων ὑπηρεσίᾳ, τριακοσίους ἄνδρας ἐκ τῶν ἐπιφανεστάτων οἴκων τοὺς ἐρρωμενεστάτους τοῖς σώμασιν ἐπιλεξάμενος, οὓς ἀπέδειξαν αἱ φρᾶτραι τὸν αὐτὸν τρόπον, ὅνπερ τοὺς βουλευτὰς ἑκάστη φράτρα δέκα νέους, τούτους τοὺς ἄνδρας ἀεὶ περὶ αὑτὸν εἶχεν· §2.13.2ὄνομα δὲ κοινὸν ἅπαντες οὗτοι ἔσχον κελέριοι, ὡς μὲν οἱ πλείους γράφουσιν ἐπὶ τῆς ὀξύτητος τῶν ὑπηρεσιῶν, ʽτοὺς γὰρ ἑτοίμους καὶ ταχεῖς περὶ τὰ ἔργα κέλερας οἱ Ῥωμαῖοι καλοῦσινʼ ὡς δὲ Οὐαλέριος ὁ Ἀντιεύς φησιν ἐπὶ τοῦ §2.13.3ἡγεμόνος αὐτῶν τοῦτʼ ἔχοντος τοὔνομα. ἦν γὰρ καὶ τούτων ἡγεμὼν ὁ διαφανέστατος, ᾧ τρεῖς ὑπετάγησαν ἑκατόνταρχοι καὶ αὖθις ὑπʼ ἐκείνοις ἕτεροι τὰς ὑποδεεστέρας ἔχοντες ἀρχάς, οἳ κατὰ πόλιν μὲν αἰχμοφόροι τε αὐτῷ παρηκολούθουν καὶ τῶν κελευομένων ὑπηρέται, κατὰ δὲ τὰς στρατείας πρόμαχοί τε ἦσαν καὶ παρασπισταί·
And when he had also organized the council of elders from the hundred men, seeing as was natural that he would also need some organized force of young men for the guard of his person and for service in urgent tasks, he chose three hundred of the most robust in body from the most illustrious houses—whom the phratries nominated in the same manner as each phratry had nominated ten young men for the senators—and kept these men always about him. And all these had the common name of Celeres, as most writers state, from the speed of their services ('for the Romans call those who are prompt and swift in active duties celeres'), but as Valerius Antias says, from their leader who had this name. For there was also a most distinguished leader of these, to whom three centurions were subordinate, and again under them others who held the lower offices; these accompanied him as lancers and servants of his commands in the city, but in campaigns they were vanguard combatants and shields-bearers.
καὶ τὰ πολλὰ οὗτοι κατώρθουν ἐν τοῖς ἀγῶσι πρῶτοί τε ἄρχοντες μάχης καὶ τελευταῖοι τῶν ἄλλων ἀφιστάμενοι, ἱππεῖς μὲν ἔνθα ἐπιτήδειον εἴη πεδίον ἐνιππομαχῆσαι, πεζοὶ δὲ ὅπου τραχὺς εἴη καὶ ἄνιππος τόπος. §2.13.4τοῦτό μοι δοκεῖ παρὰ Λακεδαιμονίων μετενέγκασθαι τὸ ἔθος μαθὼν ὅτι καὶ παρʼ ἐκείνοις οἱ γενναιότατοι τῶν νέων τριακόσιοι φύλακες ἦσαν τῶν βασιλέων, οἷς ἐχρῶντο κατὰ τοὺς πολέμους παρασπισταῖς, ἱππεῦσί τε οὖσι καὶ πεζοῖς.
And they achieved success in most of the contests, being the first to begin the battle and the last of all to retreat, acting as cavalry where the plain was suitable for horse-fighting, and as infantry where the terrain was rough and impassable for horses. This custom, it seems to me, he transferred from the Lacedaemonians, having learned that among them also three hundred of the noblest of the youth were guards of the kings, whom they used in wars as shields-bearers, being both cavalry and infantry.