Augustine's influence runs deep and broad through Western Christian doctrine and ethics. This paper focuses on two particular examples of this influence: his thinking on political order and on just war. Augustine's conception of political order and the Christian's proper relation to it, developed most fully in his last and arguably most comprehensive theological work, The City of God, is central in both Catholic and mainline Protestant thinking on the political community and the proper exercise of government. Especially important in recent debate, the origins of the Christian idea of just war trace to Augustine. Exactly how Augustine has been read and understood on these topics, as well as others, has varied considerably depending on context, so the question in each and every context is how to read and understand Augustine.