The list of scholars, pilgrims, and friends who have contributed in some way to the creation of this book would almost fill a book in itself. I must single out for particular thanks my editor at Arc Humanities, Anna Henderson, who suggested this book to me, and I would not have written it otherwise. The editorial team at Arc Humanities have been unfailingly helpful and efficient. The University of Birmingham Medieval Research Seminar heard the first two chapters and focused my thinking. The Getty Collection making their images free to use and publicly available made the task of finding suitably interesting and licensable illustrations far simpler. The anonymous reader offered invaluable and very generous comments. Pete Jones and Chelsea Johnson read it and made it far more readable. My primary thanks, as always, are to Sarah.