Margaret Mary Alacoque
July 22, 1647 — October 17, 1690 · Feast day: October 16
Margaret Mary Alacoque was a French Visitation nun whose private visions in Burgundy reshaped Catholic devotion worldwide. In June 1675, Christ appeared and asked her to spread devotion to His Sacred Heart — a movement already beginning to travel through Jesuit networks before she died at forty-three at Paray-le-Monial.