St. Gertrude the Great, a Cistercian nun, is one of the most lovable German saints from medieval times, and through her writings she will remain for all ages a guide to the interior life. She was born in 1256 at Eisleben and at the age of five taken to the convent at Rossdorf, where Gertrude of Hackeborn was abbess. Similarity in name has often occasioned confusion between the two Gertrudes. Our St. Gertrude never functioned as superior.
In spite of much ill-health, Gertrude used her exceptional natural talents well, knew Latin fluently. When she was twenty-five years old (1281), Christ began to appear to her and to disclose to her the secrets of mystical union. Obeying a divine wish, she put into writing the favors of grace bestowed upon her. Her most important work, Legatus Divinae Pietatis, "The Herald of Divine Love," is distinguished for theological profundity, sublime poetry, and unusual clarity. How it stimulates love of God can be felt only by reading it; Abbot Blosius is said to have read it twelve times each year. St. Gertrude died in 1302, more consumed by the fire of God's love than by fever. http://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2013-11-16