This work refers to the evolution of international law, funda-
mentally since the adoption of the San Francisco Charter. The work propo-
ses two fundamental concepts: first, the creation of the rule of international
law and the second concept is the existence of an international public order.
The International Public Order (IPO) is a minimum legal standard, which
has multiple components, and which cannot be exceeded by the sub-
jects of international law, under penalty of their acts being vitiated by
absolute nullity or being a cause of international responsibility. In other
words, it is a limit to the action of the subjects of international relations
since their activity cannot exceed them because it would violate the Rule
of International Law (RIL). This international public order is composed of
human rights norms, the principles of international law, norms of interna-
tional humanitarian law and environmental norms. In addition, these ru-
les and principles that make up the international public order have spe-
cific characteristics that give them originality compared to other rules.
