 However, recent studies have proposed the troubadour Gui de Cavalhon as the author of the second part.It is one of three major contemporary narratives of the Albigensian Crusade, the "Historia Albigensis" of Pierre des Vaux-de-Cernay and the "Chronica" of William of Puylaurens being the others.There is a single surviving manuscript of the whole "Song" (fr.