Taking its cue from Benjamin's Constant's famous essay, this article uses the case of EU citizenship to explore how far ancient, civic, freedom can be combined with modern, market, freedom. Many commentators have, in different ways, argued that the forces promoting European integration call for a new form of post-national citizenship that either builds civic freedom on the basis of the liberties of the moderns or does away with the need for it altogether. These arguments are disputed. Constant perceptively raised a number of problems with this analysis, while ignoring - or being ignorant of - a number of others. As he noted, ancient liberty corrects various pathologies and lacunas of modern liberty, but he overlooked the degree to which its...