Article 52(1) of the EU Charter of Fundamental Rights lays down respect for the essence of right as one of the requirements that limitations on rights must respect. This provision is not innovative, as it formalizes into EU law the distinction between “core” and “periphery” of rights present in many national constitutions and in the ECJ and ECtHR case law. Nonetheless, the express reference to essence has given unprecedented resonance to that concept. Essence as the “limit of limits” has a Janus-like character. On the one hand, it pronounces that every fundamental right bears a minimum content which is ringfenced from interference by public and private actors. On the other hand, it stresses the malleability of rights and their social function. The core/periphery dichotomy reflects a balancing act moored in European legal tradition whose symbolism outperforms its utility as a judicial tool. This Article examines the essence clause of the Charter in light of the ECJ case law and the constitutional traditions of the Member States and assesses its role in the framework of fundamental rights protection in EU law. The Article first attempts a classification of rights limitations clauses in national constitutions, following which it discusses the interpretation of essence by the Spanish and the Italian Constitutional Courts. The Article then engages with a theoretical discussion of the concept of essence and examines the case law of the ECJ. Lastly, it looks at the limitations of the concept as a rights protection instrument in EU law.

This Article introduces our Special Issue by posing a central question: What is the added value of the increasing prominence of the concept of the “essence” of fundamental rights in EU law? It will address this larger question in four steps: First, by examining the function of the concept in EU law and the methods for its derivation; second, by summarizing how its application diverges across EU—and international—law; third, by outlining some enduring difficulties with the essence concept; and finally, by reflecting on its future role in EU law, including its impact on other sites of legal authority—such as domestic fundamental rights, the political institutions of the EU, and international human rights law. As the other articles of this issue demonstrate, while there is not yet a coherent approach to deriving and understanding the essence of rights across the fundamental rights the EU must protects, the essence concept plays an increasingly significant role in demarcating the boundaries between the EU’s legal and political orders and between overlapping sites of legal authority. Recent developments—such as the rule of law “crises”—are likely to further amplify the importance of “essence” to EU law practice and scholarship.