Dom Prosper Louis Pascal Guéranger, Servant of God, was a Benedictine priest, abbot of Solesmes Abbey (which he founded in the disused priory of Solesmes) and founder of the French Benedictine Congregation (now the Solesmes Congregation). Dom 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. Dom Guéranger is credited with reviving the Benedictine Order in France, and revitalizing the Tridentine Mass.