Peter of Cluny, wrote a treatise called Epistola seu tractatus adversus Petrobrusianos (Migne, Patr. Lat. clxxxix) against the disciples of Peter of Bruys...

world, i.e., Christians, Jews, Saracens, and pagans . . ." (Contra Petrobrusianos haereticos 161, p. 94). Both Jews and Muslims, however, will be subject...