St. Margaret Mary Alacoque, a French Roman Catholic Visitation nun and mystic, is greatly recognized for her devotion to the Sacred Heart of Jesus.
She was born in 1647 in France as the only daughter of Claude and Philiberte Lamyn Alacoque. Margaret has always shown an intense love for the Blessed Sacrament and preferred silence over typical childhood play. She began practicing severe corporal mortification after her first communion at 9-years-old.