What was one of the first sources of international law that sought to regulate war?

Name: What was one of the first sources of international law that sought to regulate war?
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The Catholic Church was one of the first sources of international law that sought to regulate war, particularly through the Just War Theory, which aimed to provide a moral framework for war, emphasizing the importance of fighting for a just cause and conducting war in a just manner.

What Was One of the First Sources of International Law