Augustine’s The City of God fundamentally shaped Western political and legal philosophy by distinguishing between the earthly city—driven by self-love and the lust for domination—and the heavenly city—ordered toward justice and eternal peace. This framework relativized political authority, asserting that no earthly government can be the source of ultimate justice. Augustine’s famous claim that “without justice, kingdoms are nothing but great bands of robbers” became a cornerstone of Western jurisprudence, while his formulation of just war theory—requiring legitimate authority, just cause, and right intention—laid the ethical foundation for centuries of legal thought on armed conflict. By grounding human law in eternal and natural law, and by articulating the limits of political power, Augustine’s work established itself as a foundational text in the tradition of political and legal philosophy, influencing thinkers from Thomas Aquinas to Grotius and shaping debates on justice, authority, and the moral foundations of law that continue to this day.
