Niccolo Machiavelli, The Prince (1532)

Few, if any, works of political philosophy have been more important for grand strategy and diplomacy than The Prince. Written by the Florentine philosopher and statesman, Niccolò Machiavelli (1469-1527), The Prince, along with Machiavelli’s other major work, Discourses on Livy, brought about a transformation in political theory and political practice.

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Plato, Laches (Fourth Century BC)

One might wonder what someone as supposedly “abstract” or “metaphysical” as Plato could offer by way of strategic insight. Why should practical men, not philosophers, read Plato? Although one could point to a number of examples showing both the speculative and practical worth of the Platonic corpus, the Laches stands out for two reasons. The first is that it is a dialogue on courage, or more literally “manliness,” which seems a quality above all necessary for the successful conduct of warfare.

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Polybius, The Histories (circa 150 BC)

Polybius’ origins as a servant of the Achaean League is interesting in part because he offers a vision of international politics between world domination and total anarchy—a sophisticated alliance system of similar democratic regimes that fended off, on both the strategic and diplomatic level, domination by the more powerful Sparta, Macedon, and Rome. The corollary to the rise of Rome is the decline of the Achaean League, and the Histories of Polybius marks out various possibilities for how we can envision the ordering of international life. Political history reveals that there are far more possibilities to political life than those straitjacketed by modern theory may suppose. In this regard Polybius continues the tradition of classical political science and the classical approach to political history as expressed by Herodotus, Thucydides, and Xenophon.

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Thomas Hobbes, On the Citizen (1642)

Hobbes’s contribution to international relations theory is, for all its significance, rather indirect. Hobbes sets out to give an account of the origin and preservation of internal political order. His practical intention is to foster peace, primarily within and only secondarily among nations. Yet Hobbes invites us to draw lessons about international relations from his political theory when he identifies the state that countries find themselves in as the state of nature. The way to Hobbes’s theory of international relations is therefore largely inferential in character.

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Xenophon, The Education of Cyrus (ca. 370 BCE)

The Education of Cyrus is no simple paean to Cyrus, nor a handbook showing how to rule the world. Xenophon meditates on the conditions of uniting independent nations under unified political leadership, and the costs of so doing. The possession of empire can be as detrimental to the rulers as it is to the ruled. The Persians were once much like the Spartans, but they were changed by the rule of Cyrus. Xenophon thus shows that little is “natural” in the superior qualities of Greek soldiers when compared against the Persians. Keeping independent and separate political communities, with the attendant possibility of war and instability, seems very much wrapped up with the virtues necessary for successful warfare. The choice between empire and independence is one of the most fundamental political choices, and Xenophon deftly shows the Greeks and the later world the costs, limits, and possibilities of becoming an imperial power.

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