Syllabus of Errors
The Syllabus of Errors is the name given to an index document issued by the Holy See under Pope Pius IX on 8 December 1864 at the same time as his encyclical letter Quanta cura. It collected a total of 80 propositions that the Pope considered to be current errors or heresies, pairing the briefest headings with references to the various documents where the actual teachings are found.