The theory of the just war originates from the Catholic theologians St Augustine (354-430) and St Thomas Aquinas (1225-1244). Augustine created the beginning of the theory by saying that Christian soldiers could serve god and country honourably and that they should not be ashamed to fight to protect peace or punish wickedness. Thomas Aquinas expanded on Augustine’s ideas by setting the rules under which a war was just. The theory was expanded further by the theologists of the School of Salamanca in the 16th century. It said that a war was just only as a last resort to prevent greater evil and that diplomacy was preferable. It also created additional rules.

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