MacCormick’s nationalism and constitutionalism are inseparable from his theorisation of Europe as holding out political promise for stateless nations, like Scotland. But MacCormick’s interest in Europe also yields conceptual innovation of its own kind, with MacCormick characterising Europe as ‘a post sovereign commonwealth’ governed by ‘subsidiarity’, also embracing ‘constitutional pluralism’ in Europe. This chapter examines MacCormick’s philosophical engagement with Europe, alongside his direct, political involvement in it, first as a Member of the European Parliament (1999–2004) and, at the same time, as a Member of the Convention on the Future of Europe, where MacCormick made important contributions to the writing of the European Constitution. Emphasising MacCormick’s sensitivity to the quality of political discourse, this chapter reads MacCormick’s approach to Europe as a matter of character, e.g., how he deployed a conceptual language – speaking of subsidiarity rather than sovereignty – that he thought could facilitate better relations between political communities.