Plato, Laws 681c

καὶ μὴν τούς γε αὑτῶν νόμους ἀρέσκειν ἑκάστοις ἀναγκαῖόν που, τοὺς δὲ τῶν ἄλλων ὑστέρους. οὕτως. ἀρχῇ δὴ νομοθεσίας οἷον ἐμβάντες ἐλάθομεν, ὡς ἔοικεν. πάνυ μὲν οὖν. τὸ γοῦν μετὰ ταῦτα ἀναγκαῖον αἱρεῖσθαι τοὺς συνελθόντας τούτους κοινούς τινας ἑαυτῶν, οἳ δὴ τὰ πάντων ἰδόντες νόμιμα, τά σφισιν ἀρέσκοντα αὐτῶν μάλιστα εἰς τὸ κοινὸν τοῖς ἡγεμόσι καὶ ἀγαγοῦσι τοὺς δήμους οἷον

And no doubt each clan was well pleased with its own laws, and less well with those of its neighbors. True. Unwittingly, as it seems, we have now set foot, as it were, on the starting-point of legislation. We have indeed. The next step necessary is that these people should come together and choose out some members of each clan who, after a survey of the legal usages of all the clans, shall notify publicly to the tribal leaders and chiefs (who may be termed their kings) which of those usages please them best,