Who was the first great articulator of a just war theory in the West?

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Augustine of Hippo is widely considered the first great articulator of a just war theory in the West. In his work "The City of God," he developed a set of principles for determining when war is justified, including that it must be waged with the intention of restoring peace and that it should be a last resort after all peaceful options have been exhausted. His ideas have had a profound influence on the development of just war theory in the Western world.

Who Was the First Great Articulator of a Just War