For more than two centuries, "Butler's" has been one of the best known, most widely consulted hagiographies. In its brief and authoritative entries, readers can find a wealth of knowledge on the lives and deeds of the saints, as well as their ecclesiastical and historical importance since canonization.

St. Louis Mary De Montfort (1673–1716), author of this “Letter,” is widely known through his treatise on “The True Devotion to the Blessed Virgin Mary” and its abridgment “The Secret of Mary.” Well has he merited the title of “Apostle of Mary” and deservedly he is called “Tutor of the Legion of Mary.” Addressing the many pilgrims at the canonization of St. De Montfort, July 1947, the Holy Father calls him “the guide who leads you to Mary and from Mary to Jesus.” Aeterna Press