Customary law
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A legal custom is the established pattern of behavior within a particular social setting. A claim can be carried out in defense of "what has always been done and accepted by law". Customary law exists
A court presided over by a customary chief in the Belgian Congo, c.1942
Universal jurisdiction
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Universal jurisdiction is a legal principle that allows states or international organizations to claim criminal jurisdiction over an accused person, regardless of where the alleged crime was committed
Customary law
…have been long-established in a given locale. However, the term can also apply to areas of international law where certain standards have been nearly universal in their acceptance as correct bases of action – for example, laws against piracy or slavery (see hostis humani generis). In many, though not all…
Title page from the second edition (Amsterdam 1631) of De jure belli ac pacis. First published in 1625, Grotius advances a system of principles of natural law, which are held to be binding on all people and nations regardless of local custom.
Defendants at the Nuremberg trials listening to translated evidence through headphones
Adolf Eichmann being sentenced to death at the conclusion of his trial