Dom Gaspar Lefebvre, O.S.B. (1880-1966) is perhaps the preeminent representative of the authentic Liturgical Movement. While better known for his internationally popular St. Andrew Missal, this book—originally entitled Liturgia—is his masterpiece.
The significance of this 1954 work, is explained in his Preface: Let anyone desiring to be fully convinced [that a return to the liturgy as “a most efficacious means of ‘restoring all things in Christ’”] ...read the pages of Liturgia.
They have been written to explain the principles—too often unknown or misunderstood—which must guide the liturgical apostolate. In them we have endeavoured to show in how many ways the liturgy is the “primary and indispensable source of the true Christian spirit.”
Joined the Benedictine Order in 1900 and ordained a priest in 1904, he completed his theological studies at Mont-Cesar Abbey in Louvain under Dom Columba Marmion. He spent five decades at St. Andre Abbey at Bruges.