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Francisco de Vitoria, Relectiones (1538-1539)

War is essential in Vitoria’s work because Vitoria’s concept of sovereignty is elaborated mainly in terms of the sovereign’s right to wage war. As Vitoria constructs a law of nations, administered by the sovereign, he reintroduces Christian norms as universal rules endorsed by jus gentium. Evangelizing is authorized not by divine law but by the law of nations, and may be likened now to travelling and trading. Vitoria argues that “…ambassadors are inviolable in the law of nations (jus gentium). The Spanish are the ambassadors of Christendom, and hence the barbarians are obliged at least a fair hearing and not expel them.” Thus, acceptance of the Christian faith could not be forced and should not serve as an excuse for conquest.

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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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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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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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On Sophocles’ Antigone and Modern Tyrants

Tyrants are prone to seek domination of ever-larger possessions, and the only constraint on their expansion, aside from internal strife, is effective opposition by external powers. If they are not combated, tyrants can indeed be highly disruptive of international stability.

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Thomas Paine’s Common Sense (1776)

Thomas Paine’s pamphlet, Common Sense, published in Philadelphia in January 1776, is properly recognized as a major turning point in the American Revolution.  Paine effectively publicized the basic argument that Patriots like John Adams and Richard Henry Lee had been making privately in the Continental Congress – that the cause of the

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Jakub Grygiel on the Two Princes

As a young man, before assuming the throne, Frederick the Great of Prussia famously wrote a tract, Anti-Machiavel, attacking Machiavelli’s teachings in The Prince. Frederick did so ostensibly under the influence of the nascent Enlightenment (and in the spirit of enlightened absolutism), but his later conduct of foreign policy, particularly his grab of Silesia, struck many as being rather more in the spirit of Machiavelli. Either that, or the Enlightenment misunderstood itself.

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Machiavelli, The Art of War (1521)

In The Art of War, the only one of his major writings published during his lifetime, Machiavelli sets out to consider that topic from the standpoint of the superintending military commander. The Art of War is divided into a preface and seven books (chapters), presented as a series of dialogues that take place in the garden of Cosimo Rucellai, a friend of Machiavelli, who had died two years before the book was published. Cosimo and his guests, including a silent Machiavelli, respectfully question a visitor, Fabrizio Colonna, who is treated as a military authority. Fabrizio discusses how an army should be raised, trained, organized, deployed and employed. His model is the Roman Legion of the Republic, which he argues should be adapted to the contemporary situation of Renaissance Florence.

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Herodotus, The Histories (5th Century BCE)

Herodotus, who wrote a generation after the Persian Wars, puts these battles in the context of a great clash of civilizations, between Greek freedom and Asian despotism. He seeks to explain why and how a relatively poor, small, and divided collection of Greek-speakers were able to defeat a much larger, wealthier, and centralized empire. On the battlefield itself, on land and at sea, the Greeks were better disciplined and employed superior close-order tactics, such as staying in ranks rather than attempting to kill the greatest number of enemy soldiers in open combat. But Herodotus' generic answer reflected the views of his contemporaries and greatly influenced the West's understanding of itself: "As long as the Athenians were ruled by a despotic government, they had no better success in war than any of their neighbors. Once the yoke was flung off, they proved the finest fighters in the world."

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