Beginning in the late seventeenth century, France and neighbouring areas saw a flurry of independent missals published by bishops influenced by Jansenism and Gallicanism. This ended when Bishop Pierre-Louis Parisis of Langres and Abbot Guéranger initiated in the nineteenth century a campaign to return to the Roman Missal. Pope Leo XIII then took the opportunity to issue in 1884 a new typical edition that took account of all the changes introduced since the time of Pope Urban VIII. Pope Pius X also undertook a revision of the Roman Missal, which was published and declared typical by his successor Pope Benedict XV on 25 July 1920.