Natural law
Ancient Rome

In the Fifth Book of his History of the Roman Republic Livy puts a formulation of the Natural Law into the mouth of Marcus Furius Camillus during the siege of the Falerii "You, villain, have not come with your villainous offer to a nation or a commander like yourself. Between us and the Faliscans there is no fellowship based on a formal compact as between man and man, but the fellowship which is based on natural instincts exists between us, and will continue to do so. There are rights of war as there are rights of peace, and we have learnt to wage our wars with justice no less than with courage. We do not use our weapons against those of an age which is spared even in the capture of cities, but against those who are armed as we are, and who without any injury or provocation from us attacked the Roman camp at Veii. These men you, as far as you could, have vanquished by an unprecedented act of villainy; I shall vanquish them as I vanquished Veii, by Roman arts, by courage and strategy and force of arms."
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