IRRC No. 320

Origin of the twin terms jus ad bellum/jus in bello

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The august solemnity of Latin confers on the terms jus ad helium and jus in bello the misleading appearance of being centuries old. In fact, these expressions were only coined at the time of the League of Nations and were rarely used in doctrine or practice until after the Second World War, in the late 1940s to be precise. This article seeks to chart their emergence.

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