The author of the popular What Is Catholicity? Here turns to biography to tell the dramatic story of St. Cajetan of Thiene, the little-known saint and founder of the Clerks Regular (The Theatines ), who was one of the most prominent figures in the Catholic reform movement of the sixteenth century, before and after the Protestant revolt. Much of St. Cajetan's story merges with the history of the Catholic reform movement and the Protestant revolt. Against this tumultuous background Paul H. Hallett projects an engrossing study of a man and saint who deserves to be far better known than he is.