Civil, economic, political and social rights are at the centre of the concept of European citizenship. In this volume, the focus is on the political-constitutional dimension of European citizen­ship, which is discussed from the perspective of several disciplines – history, constitutional law and political science. It provides a multi-faceted account of the evolution of European citizenship and its institutionalization, explaining why certain rights came into existence at a certain time and focussing on several key actors involved, such as the European Court of Justice.