Saint Louis de Montfort 
True Devotion to Mary: With Preparation for total Consecration. Illustrated 

Saint Louis de Montfort is known as the founder of the cult of the Virgin Mary in the Catholic Church. He devoutly adhered to Mariology and expounded on the benefits of saying the Rosary. As a result of his spiritual meditations, he wrote his most famous work: True Devotion to the Blessed Virgin. In this work, de Montfort developed the concept of voluntary spiritual slavery to the Virgin Mary in order to worship Christ in her and become like Christ.
St Loius de Montfort’s beliefs led to the development of several Catholic groups, the Brothers of St. Gabriel being one of the most enduring. With the support of these brothers, Pope John Paul II signed a treatise that supported and synthesized de Montfort’s teachings into a single document. That year, the brothers also opened the Montfort Center.

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Louis-Marie Grignion de Montfort (31 January 1673 – 28 April 1716) was a French Roman Catholic priest and confessor. He was known in his time as a preacher and was made a missionary apostolic by Pope Clement XI.