The book "History of the reign of Ferdinand and Isabella the Catholic. Volume 1" was written by the outstanding American historian William Hickling Prescott. In this work, the author examines the reigns of Ferdinand II of Aragon and Isabella I of Castile - the kings who united their kingdoms and started the unified Royal Order in Spain. Prescott details the political, social and cultural aspects of their reign, describing the key events and decisions that shaped a new era in the history of Spain and the entire European continent. This book is an important source for understanding the development of Spain in the late 15th and early 16th centuries and will make a valuable contribution to the knowledge of European history.