 Guéranger was the author of "The Liturgical Year", which covers every day of the Catholic Church's Liturgical cycle in 15 volumes.He was well regarded by Pope Pius IX, and was a proponent of the dogmas of papal infallibility and the Immaculate Conception.Guéranger is credited with reviving the Benedictine Order in France, and the implementation of the Tridentine Mass in France, though he is also regarded as the grandfather of the Liturgical Movement, which led to further reform of the Mass of the Roman Rite beyond its Tridentine form.