Book excerpt: A comprehensive history that focuses on the crises of Spain in the late middle ages and the early transformations that underpinned the later successes of the Catholic Monarchs. Illuminates Spain's history from the early fourteenth century to the union of the Crowns of Castile and Aragon in 1474 Examines the challenges and reforms of the social, economic, political, and cultural structures of the country Looks at the early transformations that readied Spain for the future opportunities and challenges of the early modern Age of Discovery Includes a helpful bibliography to direct the reader toward further study