Guy (died 21 March 1223) was the sixth Cistercian abbot of Vaux-de-Cernay from 1181 until 1210 and then the bishop of Carcassonne from 1212 until his death. The crusades dominated his life. He was a preacher, organizer and spiritual leader of the Fourth Crusade, which he abandoned after it turned against fellow Catholics, and also of the Albigensian Crusade against heretics.
Guy's nephew, Peter, also a monk of Vaux-de-Cernay, chronicled his uncle's career in his Hystoria Albigensis.[1][2] Guy "appears in the sources as a preacher primarily, not a participant in military action."[3]