Abstract
Although H. Kelsen is not named as the predecessor of constitutionalism in the international law, he inspired it in many ways.
Despite several differences, there is no insuperable gap between H. Kelsen's teachings and the international constitutionalism, if we look at both of these theories not as closed models, but more as methods intended to interpret the applicable international law.
One of the most inspiring parts of Kelsen's teachings is his logical approach to the legal order, which he understands as an organized body, as well as his emphasis on responsibility and sanctions. Moreover, it is important to note, that the legal rules do not directly arise from social needs, but that they are formed on the basis of a rule-making procedure, in which the role of States is the most important.
It is therefore necessary to differentiate between the view (and methods) of the jurisprudence and political science or international politics. On the other hand, the international constitutionalism theory reminds us of several important fact - firstly, that all subjects, including States, are bound by the rules of international law; secondly that the role of international organizations and courts promises to grow even more; and last but not least, that the international law is not value-neutral, as its main objective is to protect peace, justice and human rights.