I acknowledge with thanks the helpful comments made on drafts of this study by John Baker, Luigi Condorelli, Yoram Dinstein, Gerald Harriss, Peter Haggenmacher, Graham Hughes, Colin Kidd, Peter Lewis, Andreas Lowenfeld, Aryeh Neier, David Norbrook, Ashley Roach, Donna Sullivan and Malcolm Vale. In addition, for their important help, I thank my research assistants David Berg, Joni Charme, Maria Chedid, Jenny Edelstein, and Audrey Schaus, and my Secretaries Marianne Martin, Isabelle Gerardi, and Doreen Ryan.
I owe a deep debt of gratitude to Maurice Keen and other Oxford medieval historians for their invaluable advice and guidance, so generously given.
I wish to express my appreciation to the Filomen D'Agostino and Max E. Greenberg Research Fund of New York University Law School, the Fellows and the staff of All Souls College, Oxford, where, as a Visiting Fellow in 1989 and 1991 I did much of the research for this study. I also thank the Graduate Institute of International Studies, Geneva, for its support, the American Journal of International Law for permitting me to use throughout this book sections of my article 'Shakespeare's Henry the Fifth and the Law of War', which appeared in the January 1992 issue of the Journal, and to the Journal's Associate Editor Anna Ascher for her outstanding editing of that article.
Finally, I am grateful for the help and courtesy of the staff of the Clarendon Press, and particularly for the encouragement offered by Richard Hart, Senior Law Editor.