The supranational law of the European Union represents a uniquely powerful, far-reaching, and controversial instance of the growth of international legal governance, one that has forever altered the political and legal landscape of its Member States. The EU has attracted significant attention from political scientists, economists, and lawyers who have analysed its polity and constructed theoretical models of the integration process. Yet it has been almost entirely neglected byanalytic philosophers, and the philosophical tools that have been developed to analyse and evaluate the Union are still