Margaret Mary, Saint, 1647–90, French nun of the Visitation Convent of Paray-le-Monial, Saône-et-Loire dept., France. Her family name was Alacoque. Jesus appeared to her in a number of visions. In one of the visions she experienced Jesus requested she inaugurate devotion to his Sacred Heart. Devotion to the Sacred Heart has become one of the principal cults of the Roman Catholic Church, largely as a result of St. Margaret Mary's visions. She was canonized in 1920. Feast: Oct. 17.