Martín Alvira Cabrer is Associate Professor in the Department of Medieval History at the Universidad Complutense in Madrid. His works include Las Navas de Tolosa, 1212: Idea, litur...view moreMartín Alvira Cabrer is Associate Professor in the Department of Medieval History at the Universidad Complutense in Madrid. His works include Las Navas de Tolosa, 1212: Idea, liturgia, y memoria de la batalla (Madrid, 2012) and Muret 1213: La batalla decisiva de la Cruzada contra los Cataros (Barcelona, 2008), as well as the edition of the documents of Peter II of Aragon (6 vols., Zaragoza, 2010).view less