Plato, Laws 751a

ἀλλὰ μὴν μετά γε πάντα τὰ νῦν εἰρημένα σχεδὸν ἂν ἀρχῶν εἶέν σοι καταστάσεις τῇ πόλει. ἔχει γὰρ οὖν οὕτω. δύο εἴδη ταῦτα περὶ πολιτείας κόσμον γιγνόμενα τυγχάνει, πρῶτον μὲν καταστάσεις ἀρχῶν τε καὶ ἀρξόντων, ὅσας τε αὐτὰς εἶναι δεῖ καὶ τρόπον ὅντινα καθισταμένας· ἔπειτα οὕτω δὴ τοὺς νόμους ταῖς ἀρχαῖς ἑκάσταις ἀποδοτέον,

Well then, after all that has now been said, you will next come, I suppose, to the task of appointing magistrates for your State. That is so. In this there are two branches of civic organization involved,— first, the appointment of magistracies and magistrates, with the fixing of the right number required and the proper method of appointment; and next the assignment to each magistracy of