Narratives of Constitutionalization in the European Union Court of Justice and in the European Court of Human Rights Case Law

Constitutionalization is a peculiar process which characterizes the whole fabric of modern international law. It may however display different levels of evolution and different implications when distinct legal sub-systems are considered: this appears to be especially true at the European level, in particular in the context of the European Union law and of the European Convention on Human Rights. This article aims at unveiling the key elements of the constitutionalization process as developed by the judges sitting in Luxembourg and Strasbourg. In their relevant case law, both the EU Court of Justice (ECJ) and the European Court of Human Rights (ECtHR) have identified the core concepts and elements lying behind the constitutionalization of their respective legal systems. The analysis of the ECJ and ECtHR case law will be divided into two different parts dealing with the internal dimension from one side, and external one fromthe other side. While presenting nuances and implications that are linked to the diverse degree of integration of the two legal systems, it may be submitted that the core elements of constitutionalization depicted by the Luxembourg and Strasbourg judges reveal some common patterns