Donald J. Kagay, Ph.D. (1981), Fordham University, is retired from Albany State University and is currently an adjunct professor at the university of Dallas. He has edited nine collections of essays, has written four monographs, two of which with Andrew Villalon, and forty-five articles. He is one of the founders of the Texas Medieval Association (remaining its secretary treasurer), De Re Militari, and the Georgia Medievalists Group.L.J. Andrew Villalon, Ph.D. (1984), Yale University is retired from the University of Cincinnati as a professor emeritus in the Department of Romance Languages and Literatures. He is the past president of De Re Militari and the Texas Medieval Association and the recipient of several grants including a Fulbright. Villalon has co-written two monographs, co-edited six collections, and published over a dozen articles in journals and collections.

"This book wilI take its place as the definitive study of the relations between Castile and Aragon in the age of the two Pedros."Joe O'Callaghan, Professor Emeritus of History, Fordham University, July 2021

• ContentsAcknowledgmentsAuthors’ Academic BiographiesGenealogies, Maps, and TablesAbbreviationsIntroductionpart 1: Background to the Conflict1 Spain: a Geographical Miscellany2 Christian Rival States of Medieval Iberia3 The Much-Contested Frontier (Thirteenth and Fourteenth Centuries)4 Two Royal War Leaderspart 2: Chronology of the Conflict5 War of the Two Pedros: Causes and First Months (1356–1357)6 The Middle Years: Expanding Warfare (1357–1363)7 Papal Efforts at Achieving Peace in the War of the Two Pedros (1357–1363)8 The Final Campaigns (1362–1365)9 Aragon’s Victory Morphs into Castile’s Civil War (1365–1366)part 3: Organization of the Conflict10 Administration and Financing of the Contending Armies11 Command Structures in the War of the Two Pedros12 The Equipment, Intelligence-Gathering Activities, Personnel, and Tactics of Iberian Armies of the Mid-Fourteenth Century13 Parliamentary Developments in the Crown of Aragon and Castile during the War of the Two Pedros14 Diplomatic Dealings in Wartime and in the Immediate Aftermath (1356–1366)15 The Fate of the Aragonese and Valencian Jews during the War Years and Beyond (1350–1369)16 The Fate of Four Frontier Towns Touched by War (1356–1372)17 Elionor of Sicily (1325–1375): Pere III’s Third Wife, Queen and Important Administratorpart 4: Aftermath of the Conflict18 Castilian Aftermath 1: the Campaign and Battle of Nájera19 Castilian Aftermath 2: Later Events and Consequences20 The Aftermath of War in the Crown of AragonConclusionAppendix I: Correspondence between Pere III of Aragon and Pedro I of Castile, 1356Appendix II: Pere III’s Administrative and Military Letters, 1356–1365Appendix III: Pedro I’s Administrative and Military Letters, 1364–1365Appendix IV: Chronicle Chapters of Ayala and Pere III, 1359–1369BibliographyIndex