  Like other classical political theorists, Thucydides (c. 460–c. 400 B.C.E.)  saw politics as involving moral questions. Most importantly, he asks whether relations among states to which power is crucial can also be guided by the norms of justice. His History of the Peloponnesian War is in fact neither a work of political philosophy nor a sustained theory of international relations. Much of this work, which presents a partial account of the armed conflict between Athens and Sparta that took place from 431 to 404 B.C.E., consists of paired speeches by personages who argue opposing sides of an issue.  Nevertheless, if the History is described as the only acknowledged classical text in international relations, and if it inspires theorists from Hobbes to contemporary international relations scholars, this is because it is more than a chronicle of events, and a theoretical position can be extrapolated from it. Realism is expressed in the very first speech of the Athenians recorded in the History—a speech given at the debate that took place in Sparta just before the war. Moreover, a realist perspective is implied in the way Thucydides explains the cause of the Peloponnesian War, and also in the famous “Melian Dialogue,” in the statements made by the Athenian envoys.