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This chapter examines St Thomas Aquinas' political ideas. Aquinas combined Aristotelian ideas with Christian concepts, distinguishing between the natural and supernatural orders, and attributing inherent validity to the natural order, including political life. His theory of law linked, through reason, the eternal law of God, natural law, human positive law, and divine law. According to Aquinas, government's justification was its purpose — securing the common good. He favoured limited monarchy in a mixed constitution. The chapter first provides a short biography of Aquinas before discussing his views on natural and supernatural orders, government, tyranny, and temporal and spiritual power. It concludes with an assessment of Aquinas' contribution to political thought in the area of just war theory.

This chapter examines the political theory and writings of French Enlightenment thinker, Montesquieu. It contends that Montesquieu’s constitutional theory of the separation of powers promoted a strong government which advanced individual freedom, maintained internal stability against absolutism and populism, and allowed the state to expand its boundaries at a moment in history when European powers were fighting each other to establish colonial empires across the world. The chapter presents the contexts in which he composed The Spirit of the Laws (1748), and then discusses Montesquieu’s typology of governments and considers the various notions of time and progress that undergird his view of how the various constitutions in the world are ordered. Finally, the chapter looks at commerce, peace, colonialism, and slavery, bringing to light the tensions and contradictions in Montesquieu’s thought.