Plato, Republic, book 1 271:

εἶτ’ οὐκ οἶσθ’, ἔφη, ὅτι τῶν πόλεων αἱ μὲν τυραννοῦνται, αἱ δὲ δημοκρατοῦνται, αἱ δὲ ἀριστοκρατοῦνται;