Catherine Léglu is Professor of French and Occitan Literature at the University of Reading. She has published extensively on troubadour poetry and related literary works of the High and Late Middle Ages. She has published two monographs, respectively on satirical poetry (2000) and the theme of multilingualism in Occitan, French and Catalan literature (2010).

Rebecca Rist is an Associate Professor in History at the University of Reading. Her research interests include the history of crusading, the papacy, medieval heresy, and Jewish-Christian relations. She has published a monograph on the papacy's authorisation of crusades in Europe during the first half of the thirteenth century (2009).

Claire Taylor is an Associate Professor in History at the University of Nottingham. Her work is on the south-west of France in the high-medieval period, with an emphasis on its religious, political and social life. She has published two monographs on heresy in the region (2005 and 2011).

Historical Introduction. Section 1: Papal Letters. Introduction. Part 1: Innocent III. Part 2: Honorius III. Part 3: Gregory IX. Section 2: Troubadour Poems. Introduction. Part 1: Political Poems. Part 2: Religion Section. Section 3: Inquisitors. Introduction Part 1: Extracts from Summaries of Crimes and Sentences. Part 2. Extracts from Depositions of Witnesses Interrogated. Part 3: Extracts from Depositions after the Siege and Fall of Monts. Part 4: Extracts from Depositions in the Processus against Peter Garcias. Part 5: Extracts from Depositions Relating to the Circle of Raymond Unaud of Lanta. Section 4: Chronicles and Narratives. Part 1: Extracts from the Song of the Albigensian Crusade by William of Tudela and the Anonymous Continuator. Part 2: Extracts from the Chronicle of Peter of Les-Vaux-de-Cernay Introduction. Part 3: Extracts from the Chronicle of William of Puylaurens Introduction. Part 4: Extracts from the Chronicle of William Pelhisson Introduction. Part 5: Extracts from The Tale of the Heretic. Further Reading.