I am grateful to many people for the help, advice, and many kindnesses I have received from them while I have been engaged in writing this book. First among them are my parents. Once again in my life, they have been the most devoted and generous of supporters; without their support I would not have been able to begin this research project. James Sparling, Tim Hochstrasser, Helga Woggon, David Reynolds, Alan Sked, Antony Best, Len Scott, Mike Foley, Lothar Kettenacker, Stephanie and Johannes von Ahlefeldt, Tillmann Braun, Tatsuko Yamazaki, Susanne Eschke, Thomas Wild, Clemens Schöll, Wolfango Piccoli, and Horst Holstein have all been generous friends along the way and have given me help from which my research has greatly benefited. My warm thanks go to all of them. Responsibility for any errors, and for all opinions expressed, remains my own. I am especially grateful to the considerate and ever-helpful staff of the archives I have used. My particular thanks go to Frau Ursula Sigmund at the BStU in Berlin.
I am also grateful to the Arts and Humanities Research Council, the British Academy, the Deutscher Akademischer Austauschdienst, the University of Wales, Aberystwyth, the German Historical Institute London, and Cambridge University's Board of Graduate Studies for the financial support they gave me in the course of this research project. My thanks go too to Anne Gelling, Kay Rogers, and Sally McCann at Oxford University Press.