This illustration is from The Lives and Times of the Popes by Chevalier Artaud de Montor, New York: The Catholic Publication Society of America, 1911. It was originally published in 1842. This Pope was in the past erroneously referred to as John XX, but on modern lists of popes there is no Pope John XX. [Artaud de Montor (1772-1849) / https://archive.org/details/thelivesandtimes00montuoft -- Public domain -- http://commons.wikimedia.org/wiki/File:Pope John XIX.jpg]