The False Decretals (also known as Pseudoisidorian Decretals) are the most influential part of a comprehensive collection of church statutes that also includes the Collectio Hispana Gallica Augustodunensis, the Capitularies of Benedict the Levite, and the Capitula Angilramni. They had their origin in approximately 850 in the kingdom of the West Franks. Though naming Isidore Mercator of Seville as their author, they seem to have been written by clergy of the archbishopric of Reims.

For their historical background we must look to the growing integration of the church in…