Saint Louis de Montfort was a French Roman Catholic priest and missionary born in 1673. He is best known for his devotion to the Virgin Mary and his teachings on the importance of Marian consecration. Montfort founded the Company of Mary and the Daughters of Wisdom, which focused on education and spiritual growth. He authored several influential works, including "True Devotion to Mary," which emphasizes the role of Mary in the spiritual life of Christians. Saint Louis de Montfort was canonized by Pope Pius XII in 1947, and his feast day is celebrated on April 28.