This book discusses the making of a constitutional law for Europe, consisting of constitutional rules and principles which are complemented by those of national constitutions. But it is further multi-layered, informed as it is by international frameworks such as the European Convention of Human Rights. The authors meticulously illustrate these connections and how they interrelate. Drawing on extensive comparative constitutional research, they explore the various dynamics of this composite constitutional structure, uncovering the common heritage on which the European Union is built. The book also examines the rich diversity in constitutional traditions between its Member States. This collection expertly untangles the constitutional complexity at the heart of the European Union.