This book is largely drawn from my Ph.D. dissertation at the University of Helsinki, titled ‘Sovereignty as Responsibility at the International Criminal Court: The ‘Frontiers’ of International Judicial Intervention’, and it could not have come into being without the generous support that I received from numerous sources. In the first place, I wish to thank my Ph.D. supervisor, Heikki Patomäki. To Heikki I offer my sincere appreciation for their continued guidance, encouragement, and critical thinking, which helped drive my research forward and to greater depths. I would also like to thank Anthony Lang, Barry Gills, Outi Korhonen, Jason Ralph, and Riikka Kuusisto for their constructive criticism of earlier versions of this book. Furthermore, I wish to acknowledge the precious advice and support provided by Martti Koskenniemi, Christine Schwöbel-Patel, Wouter Werner, Tanja Aalberts, Ekaterina Yahyaoui, William Schabas, Kevin Jon Heller, Peter Sutch, Timo Kivimäki, Tonny Brems Knudsen, Teivo Teivainen, and Michael Zürn, among several other exceptional scholars whom I have had the privilege of encountering along the journey that has brought this book to life. My most sincere appreciation also goes to Antje Wiener and the Springer editorial team, and, in particular, to Johannes Glaeser and Judith Kripp. Among the numerous other contributions that made this book possible, I would like to thank the organs of the ICC, along with all who generously took part in the interviews undertaken for the purpose of the present work. I am also greatly indebted to all my friends for the countless times they supported and encouraged me; and I cannot express enough thanks to my family for their unconditional love and appreciation, and to Matteo, as his love of wisdom and our sustained conversations were of inestimable value in the preparation of the book. Finally, I extend my heartfelt thanks to my colleagues of the ‘WISH MI—Wellbeing Integrated System of Milan’ team of the City of Milan, who have provided me with a concrete avenue for standing by those whose voices need to be better heard and for striving together for a more equal society.