The document provides a timeline and overview of the reign of Queen Isabel I of Castile and King Ferdinand II of Aragon from 1469-1516. It discusses their dynastic union through marriage in 1469, which united Castile and Aragon. It then covers their territorial expansion through conquests and marriages, building of an authoritarian monarchy through centralizing power and imposing religious uniformity, and changes to the economic and social organization of their kingdoms. Key events included the conquest of Granada in 1492, the expulsion of Jews, discovery of America that same year, and establishment of the Spanish Inquisition.