Plato, Laws 765d

δέ τις ἀποδοκιμασθῇ καθʼ ἡντιναοῦν ἀρχῆς λῆξιν καὶ κρίσιν, ἄλλους ἀνθαιρεῖσθαι κατὰ ταὐτὰ καὶ τὴν δοκιμασίαν ὡσαύτως αὐτῶν πέρι ποιεῖσθαι.λοιπὸς δὲ ἄρχων περὶ τὰ προειρημένα ἡμῖν ὁ τῆς παιδείας ἐπιμελητὴς πάσης θηλειῶν τε καὶ ἀρρένων. εἷς μὲν δὴ καὶ ὁ τούτων ἄρξων ἔστω κατὰ νόμους, ἐτῶν μὲν γεγονὼς μὴ ἔλαττον ἢ πεντήκοντα, παίδων δὲ γνησίων πατήρ, μάλιστα μὲν ὑέων καὶ θυγατέρων, εἰ δὲ μή, θάτερα· διανοηθήτω

Should any candidate be disqualified in any voting or testing for office, they shall elect a substitute, and carry out the scrutiny by the same method as in the case of the original candidate. In the department we have been dealing with, we have still to appoint an officer who shall preside over the whole range of education of both boys and girls. For this purpose there shall be one officer legally appointed: he shall not be under fifty years of age, and shall be the father of legitimate children of either sex, or preferably of both sexes.