Plato, Letters 324c

εὐθὺς ἰέναι. καί μοι τύχαι τινὲς τῶν τῆς πόλεως πραγμάτων τοιαίδε παρέπεσον. ὑπὸ πολλῶν γὰρ τῆς τότε πολιτείας λοιδορουμένης μεταβολὴ γίγνεται, καὶ τῆς μεταβολῆς εἷς καὶ πεντήκοντά τινες ἄνδρες προύστησαν ἄρχοντες, ἕνδεκα μὲν ἐν ἄστει, δέκα δʼ ἐν Πειραεῖ—περί τε ἀγορὰν ἑκάτεροι τούτων ὅσα τʼ ἐν τοῖς ἄστεσι διοικεῖν ἔδει—τριάκοντα δὲ πάντων

I would immediately enter into public life. But it so happened, I found, that the following changes occurred in the political situation. In the government then existing, reviled as it was by many, a revolution took place; and the revolution was headed by fifty-one leaders, of whom eleven were in the City and ten in the Piraeus—each of these sections dealing with the market and with all municipal matters requiring management—and Thirty were established