The Cathars claimed that theirs was the one true church and therefore denounced the Roman church as a false church which had departed from the teaching of Christ. Moneta of Cremona, the most voluminous of the Catholic apologists, devoted the final book of his treatise against the Cathars and the Waldensians to a discussion about the nature of the true church. A general statement of this kind about origins would no doubt have satisfied unsophisticated postulants, but not all consoled Cathars were simple people. Sufficient indications survive, albeit of a fragmentary kind, to show that the Cathars did have a coherent picture of the history of their church. The southern French Cathars certainly kept records and part of this material has survived in the document often misleadingly called the Acts of the Council of Saint-Felix. The Cathars of northern France, Languedoc and Lombardy to whom Nicetas addressed his mission had originally received their faith from the dualist church of Bulgaria.