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.
