In this very entertaining book, Michael A. Ryan focuses on the history of astrological studies in the Crown of Aragon during the late fourteenth century and the influence of this forbidden knowledge on its European neighbors.... It is a brilliant study of one phase of the history of science and magic in the later Middle Ages and a worthy successor to the groundbreaking research of authorities such as Valerie Flint and Lynn Thorndike.- Donald J. Kagay (The Historian) A Kingdom of Stargazers is an excellent work that exposes in a novel way the relationship of the interest in astrology and magic, the censure of this interest, and the level of authority and power of kings in the medieval Iberian Crown of Aragon. To what extent the label 'occult' is a construct of scholarship or whether it represents a historical idea, or both, is one of the themes of this book. Ryan's work offers a brilliant exploration of the sources of the court of Aragon, which reveals the complex relationship between political power and the attitudes toward astrology. Historians of medieval Spain and historians of science in general will find it worth reading; scholars interested in the history of medieval and early modern astrology, magic, or alchemy will also see in it an essential addition to scholarship.(Renaissance Quarterly)