St. Gertrude, a Benedictine nun of the monastery of Helfta in Saxony, is one of the great mystics of the Middle Ages. She was favored by visions of our Savior and has left a marvelous account of them in a book which she called “Revelations” or “The Herald of Divine Love.” St. Gertrude introduced the devotion to the Sacred Heart which, four centuries later, St. Margaret Mary spread throughout the Church when our Lord revealed it to her anew. St. Gertrude died at the beginning of the fourteenth century.