Plato, Laws 760b

πρυτάνεων, καὶ δὴ καὶ ἀστυνόμων καὶ ἀγορανόμων, ὁπόταν αἱρεθέντες ἡμῖν καταστῶσίν τινες ἱκανῶς· τὴν δὲ ἄλλην χώραν φυλάττειν πᾶσαν κατὰ τάδε. δώδεκα μὲν ἡμῖν ἡ χώρα πᾶσα εἰς δύναμιν ἴσα μόρια νενέμηται, φυλὴ δὲ μία τῷ μορίῳ ἑκάστῳ ἐπικληρωθεῖσα κατʼ ἐνιαυτὸν παρεχέτω πέντε οἷον ἀγρονόμους τε καὶ φρουράρχους, τούτοις δʼ ἔστω καταλέξασθαι τῆς αὑτῶν φυλῆς ἑκάστῳ δώδεκα τῶν πέντε

of the city-stewards and market-stewards, wherever we have such officials properly selected and appointed. All the rest of the country must be guarded in the following manner: we have marked out the whole country as nearly as possible into twelve equal portions: to each portion one tribe shall be assigned by lot, and it shall provide five men to act as land-stewards and phrourarchs (watch-captains); it shall be the duty of each of the Five to select twelve