The Book of St Gilbert was written by a canon of the Order of Sempringham and is presented here in its first, full, critical edition. It contains all the documents of the canonization process of St Gilbert and his life, including a dossier of letters concerning a major crisis of his rule, the revolt of the lay brothers; a detailed account of the canonization process; and two collections of his miracles. The book is especially revealing of the procedures of canonization at a crucial stage in its formation and provides a central body of material for the history of the Order in its first sixty years.