IT IS A PLEASURE to thank those who have played a role in making this book possible. First, that means, as always, my family, both here in Ann Arbor and in Norfolk, Connecticut, where this book began to take shape. Then too my colleagues in the Department of Classical Studies at the University of Michigan, whose congenial and collegial company makes it a pleasure to go to work, and whose willingness to alleviate my ignorance or question my certainty is perpetually engaging. I owe a great debt to the students at Michigan in whose suitably skeptical company I have been exploring the texts that form the basis for this book for many years. Finally, I owe special thanks to Lester Monts, Senior Vice Provost for Academic Affairs at the University of Michigan, whose generous support made it possible to undertake the work in Rome that was crucial to the completion of this book, and to Bill Martin, who has, over the years, shown me what it means to run a large and complex organization without losing sight of crucial values (something of which, I think, Constantine would approve). Pete Oas helped this book take shape on many genial mornings over coffee in the welcoming confines of the Expresso Royale on Plymouth Road in Ann Arbor; Maud Gleason was, as ever, a source of important advice, given her vast command of the intricacies of medical literature; Robert Lister and my colleague Ellen Muehlberger provided guidance in matters of the faith; and Laura McCullagh showed me how to think about Helena. It is also a pleasure to thank Professor Christopher Smith for sharing the hospitality of the British School at Rome, and Professor Greg Woolf for his generous assistance in helping me find my way around. It is also a pleasure to thank Dr. Andrew Meadows of the American Numismatic Society for his help with numismatic material. Harriet Fertig and Jessica Stephens offered a great deal of help at a late stage; the book is better for their careful reading and frank advice. Samantha Lash, Jonathan McLaughlin, and Tiggy Talarico provided a great deal of important help with the final proofs, for which I am also extremely grateful.
Stefan Vranka at Oxford University Press suggested this project to me and has provided excellent advice throughout. Most important, in helping me follow that advice, has been the absolutely fantastic editorial work undertaken by Sue Phillpott. Her efficiency and judgment are outstanding; without her work this book would be very different. I am also very grateful to two leading Constantinian scholars of our time, Hal Drake and Noel Lenski, for sharing their work with me in advance of publication. Molly Morrison has managed the production of this book with impressive efficiency.
Finally, it is a great pleasure to dedicate this book to two very dear friends who have helped me navigate the ancient and modern worlds for the last three decades. This book then is dedicated to Robin Lane Fox and John Matthews.