Against the background of the current Euro-crisis, the pursuit of an “ever closer” and constitutionalised Union looks like a far echo of the past. National interests and intergovernmental bargaining are now at the centre of European business. Nevertheless, the process of constitutionalisation has had a profound impact on the European polity. While we wonder what will become of the European constitutional project, it is therefore still worthwhile to cast additional light onto what it was supposed to be until a very recent time and what is left of it.