I owe gratitude to many friends and colleagues for this book, and those cited here are a small subset of the people whose help should be acknowledged. Sebastiano Maffettone, Alessandro Ferarra, Allen Buchanan, John Tasioulas and others offered valuable critical comments on part I. Michael Doyle, Bruce Russett, Daniele Archibugi, Pauline Kleingeld, Paul Guyer, Massimo Mori, Thomas Pogge and, again, many others contributed to the chapters collected in part II. In particular, I greatly profited from the criticisms I received from Joshua Cohen and his students at the Stanford Political Science Workshop. Alessandro Pinzani deserves a special mention for his help not only with part III, but for reading and commenting on the whole book, providing precious challenges to my reading on Kant when we disagreed and extra reasons to strengthen the points where we shared similar views. All the guests and participants of the Colloquium on Philosophy and Global Affairs at the University of Catania indirectly helped to shape single theses defended in the book, whose preparatory work began, perhaps not accidentally, when the Colloquium was born (2010). In a similar fashion, I profited from the discussions with Kant scholars on occasion of the various editions of the Multilateral Kant – Colloquium and of the Clélia Martins Kant – Colloquium held in Marilia (S?o Paulo, Brazil). I would also like to thank some of my students, at LUISS and at the University of Catania, who attended my graduate seminar on human rights. Special gratitude goes to my PhD student Nunzio Al? who followed and supported the development of my work. Immense gratitude goes to my family for the multiform emotional support and for the time they concede me to follow my interests.