This book is a study of medieval queenship -- an examination of the nature and role of feminine authority and power and the monarchy in the late Middle Ages. Based on an exhaustive and varied study of predominantly unpublished archival material as well as a variety of literary and non-literary sources, this book investigates the relation between patronage, piety and politics in the life and career of one Late Medieval Spain's most intriguing female personalities, Maria de Luna. She was queen-consort of Martí I (1396-1410), King of the Crown of Aragon (1396-1406), and served as his lieutenant-general (second-in-command). It was published in translation to Spanish as María de Luna. Poder, piedad y patronazgo de tuna reina bajomedieva, trans. Virginia Tabuenca (Zaragoza: Institución Fernando el Católico, Consejo Superior de Investigaciones Científicas, 2012).