As a major piece of historical detective work. Stephen Gilman's "La Celestina" and the Spain of Fernando de Rojas adds a new dimension to critical studies of the fifteenth-century masterpiece. Using the text of La Celestina as well as public and private archives in Spain, Mr. Oilman builds up a vivid sense of the man behind the dialogue and establishes Fernando de Rojas indisputably as its author-a figure whom critics, while ranking...