  Idealism in international relations, like realism, can lay claim to a long tradition. Unsatisfied with the world as they have found it, idealists have always tried to answer the question of “what ought to be” in politics. Plato, Aristotle, and Cicero were all political idealists who believed that there were some universal moral values on which political life could be based. Building on the work of his predecessors, Cicero developed the idea of a natural moral law that was applicable to both domestic and international politics. His ideas concerning righteousness in war were carried further in the writings of the Christian thinkers St. Augustine and St. Thomas Aquinas. In the late fifteenth century, when Niccolò Machiavelli was born, the idea that politics, including the relations among states, should be virtuous, and that the methods of warfare should remain subordinated to ethical standards, still predominated in political literature.