Henry Charles Lea,
A History of the Inquisition of the Middle Ages…
“ Early in 1212 the Abbot of Vaux-Cernay received in the bishopric of Carcassonne the reward of his zeal in furthering the crusade, and Legate Arnaud obtained the great archbishopric of Narbonne on the death or degradation of the negligent Berenger. Not content with the ecclesiastical dignity, Arnaud claimed to be likewise duke, giving rise to a vigorous quarrel with de Montfort, who, notwithstanding his devotion to the Church, had no intention of surrendering to it his temporal possessions. ”
