This Article revisits the role and function of constitutional identity and common constitutional traditions and claims that the latter have had an increasingly stronger influence on the process of European integration—more than may appear at first sight. In addition, the relevance of common constitutional traditions has not been undermined but, on the contrary, strengthened by the emergence of fundamental rights in EU law and the subsequent conferral of binding force on the Charter of Fundamental Rights. Constitutional identity and common constitutional traditions are part of two discourses—security and fundamental rights—which are an expression of the security of the European project as an overarching frame characterizing the EU as a polit...