Starting with the premise that the history of a medieval subject cannot be properly written without recourse to the materials it produced, Lesley Smith's Masters of the Sacred Page provides an illuminating study of theology in the Middle Ages. She focuses on the dramatic transformations of the discipline in the twelfth century and uses a collection of contemporary manuscripts as a guide to its changes and developments. Smith points out that the medieval masters of theology had a much wider view of their subject than the modern academic tendency for neatness and division can easily admit, and...