The writings of Pope Pius VI, head of the Catholic Church during the most destructive period of the French Revolution, were compiled in two volumes by M.N.S. Guillon and published in 1798 and 1800. But during the Revolution, the reign of Napoleon, and the various revolutionary movements of the 19th century, there were extraordinary efforts to destroy writings that critiqued the revolutionary ideology. Many books and treatises, if they survived the revolution or the sacking from Napoleon's armies. To this day, no public copy of Guillon's work exists in Paris.
Now, for the first time in...