Abstract
Thucydides is an important author for any discussion of the possibilities for an ancient Greek democratic peace. Though democratic peace did not, in fact, seem to function in classical Greece, a number of passages in Thucydides show that an affinity did exist among democratic factions and city-states in the context of hostile competition between democratic and oligarchic regimes. Thucydides remarked on this competition and was aware of the inter-democratic affinities, but did not seem to think them salient in city-state decisions of war and peace. The failure of democratic peace to develop may relate to the environment of the Greek city-state, which privileged local interests over broader constitutional ideals.