1. Introduction Jacco Bomhoff, David Dyzenhaus and Thomas Poole; Part I. Theoretical Foundations: 2. The Janus-faced constitution David Dyzenhaus; 3. The idea of the federative Thomas Poole; 4. Hobbes's Janus-faced sovereign Theodore Christov; 5. Jurisprudential reflections on cosmopolitan law Evan Fox-Decent; 6. From republican self-love to cosmopolitan amour-propre: Europe's new constitutional experience Alexander Somek; Part II. Border Crossings: Comity and Mobility: 7. The spectre of comity Karen Knop; 8. Constitutionalism and mobility: expulsion and escape among partial constitutions Jacco Bomhoff; 9. The inside out constitution Audrey Macklin; 10. The constitution in the shadow of the immigration state Asha Kaushal; Part III. The Foreign in Foreign Relations Law: 11. Double-facing administrative law: state prerogatives, cities and foreign affairs Geneviève Cartier; 12. The democratic challenge to foreign relations law in transatlantic perspective Helmut Philipp Aust; 13. The double-facing foreign relations function of the executive and its self-enforcing obligation to comply with international law Campbell McLachlan; 14. The various faces of fundamental rights Dieter Grimm; Index.