Few works can claim to form the foundation stones of one entire academic discipline, let alone two, but Thucydides's celebrated History of the Peloponnesian War is not only one of the first great works of history, but also the departure point from which the modern discipline of international relations has been built.

The History of the Peloponnesian War is acknowledged as the first great work in the fields of history and political theory. It uses narrative, debate, and analysis to document the war between Athens and Sparta (431-404 BCE). But its importance lies less in the story than in the way Thucydides tells it.