Baroque France (17th–18th century)
Feast: April 28
A wandering preacher so intense that bishops kept banning him from their dioceses — his book on Mary was lost for over a century and then reshaped modern Catholicism.
Louis de Montfort walked everywhere. He owned one cassock, no money, and an absolute conviction that total consecration to Mary was the fastest route to Christ. This made him popular with peasants and infuriating to bishops. He was expelled from diocese after diocese — not for heresy, but for being too much. He preached outdoor missions in Brittany and Vendée that drew thousands: dramatic, emotional affairs with bonfires of bad books, public confessions, and enormous crosses erected in town squares. He founded the Daughters of Wisdom to serve the sick and the Company of Mary to continue his missions. Then he wrote a book called True Devotion to the Blessed Virgin, and promptly died at forty-three from exhaustion. The manuscript disappeared. It was rediscovered in a chest in 1842, over a century later, and when it was finally published, it ignited a worldwide movement of Marian consecration. Pope John Paul II took his papal motto — Totus Tuus, 'Totally Yours' — directly from Montfort's writing. The wandering preacher nobody could control turned out to be one of the most influential Catholic authors of the modern era.