The aim of this article is to debate the notion of legitimacy of norms of public international law as purposed by the lawyer and professor of New York University, Thomas Franck. This contribution consists on a theoretical as well as multidisciplinary purpose in order to describe how the legitimacy of norms of international law could be evaluated through specific pedigree criteria. Beyond the criteria of determination, symbolic validation, coherence and adherence, this effort concerns to answer why the fairness wouldn't a criterion for the qualification of legitimacy in terms of international law norms.
Legitimacy; international law norms; Thomas Franck; fairness