Plato, Laws 763c

τοῦτο προσαγορεύων, προθύμως πᾶς ἀνὴρ εἰς δύναμιν ἐπιτηδευέτω, ὅσοι μέλλουσι τὴν αὑτῶν πόλιν ἱκανῶς σῴζειν.τὸ δὲ μετὰ τοῦτο ἀρχόντων αἱρέσεως ἀγορανόμων πέρι καὶ ἀστυνόμων πέρι ἦν ἡμῖν ἑπόμενον. ἕποιντο δʼ ἂν ἀγρονόμοις γε ἀστυνόμοι τρεῖς ἑξήκοντα οὖσιν, τριχῇ δώδεκα μέρη τῆς πόλεως διαλαβόντες, μιμούμενοι ἐκείνους τῶν τε ὁδῶν ἐπιμελούμενοι τῶν κατὰ τὸ ἄστυ καὶ τῶν ἐκ τῆς χώρας λεωφόρων εἰς τὴν πόλιν ἀεὶ τεταμένων καὶ τῶν οἰκοδομιῶν,

every single man who means to guard his own State efficiently shall do his duty zealously to the best of his power. The next step in our choice of officials is to appoint market-stewards and city-stewards. After the land-stewards (sixty in number) will come the three city-stewards, who shall divide the twelve sections of the city into three parts, and shall copy the land-stewards in having charge of the streets of the city and of the various roads that run into the city from the country, and of the buildings,