Rebecca Rist is a professor of medieval history and the Director of the Graduate Centre for Medieval Studies at the University of Reading. She is also the author of a number of books on the crusades, including The Papacy and Crusading in Europe, 1198-1245 (Continuum, 2009), The Cathars and the Albigensian Crusade: A Sourcebook, ed. C Léglu, R Rist and C Taylor (Routledge, 2014) and Popes and Jews, 1095-1291(OUP, 2016).