Wiener Übereinkommen über das Recht der Verträge
A peremptory norm or "jus cogens" (Latin for "compelling law" or "strong law") is a principle of international law considered so fundamental that it overrides all other sources of international law, including even the Charter of the United Nations. The principle of "jus cogens" is enshrined in Article 53 of the Vienna Convention on the Law of Treaties: