1302. Her feast day is celebrated on November 16, but the exact date of her death is unknown; the November date stems from a confusion with Abbess Gertrude of Hackeborn. One of her biographers, Gasparo Antonio Campaccio, diligently produced his own ‘Discorso Cronologico’ (pp 154–160) on her life, stating that the exact date of her death was November 17, 1334. Works Gertrude produced numerous writings, though only some survive today. The longest survival is the Legatus Memorialis Abundantiae Divinae Pietatis (known in English today as The Herald of Divine Love or The Herald of God's Loving-Kindness, and sometimes previously known as Life and Revelations), partly written by other nuns. There also remains her collection of Spiritual Exercises. A work known as Preces Gertrudianae (Gertrudian Prayers) is a later compilation, made up partly of extracts from the writings of Gertrude and partly of prayers composed in her style. It is also very possible that Gertrude was the author of a part of the revelations of Mechthild of Hackeborn, the Book of Special Grace. The Herald is composed of five books. Book 2 forms the core of the work, and was written by Gertrude herself; she states that she began the work on Maundy Thursday, 1289. Books 3, 4, and 5 were written by another nun, or possibly by more than one, during Gertrude's lifetime and probably at least in part at her dictation. Book 1 was written shortly before or after Gertrude's death as an introduction to the whole collection; it is possible it was written by Gertrude's confessor, but more probably by another Helfta nun. The importance of the Spiritual Exercises extends to the present day because they are grounded in the themes and rites of Catholic liturgy for occasions such as baptism, conversion, commitment, discipleship, union with God, praise of God, and preparation for death. Gertrude's Spiritual Exercises can still be used by anyone who seeks to deepen spirituality through prayer and meditation. Devotion to the Sacred Heart One of the most esteemed women saints of the Christian West, she was a notable early devotee of the Sacred Heart of Jesus. Book 2 of the Herald of Divine Love is notable within the history of Christian devotion because its vivid descriptions of Gertrude's visions show a considerable elaboration on the long-standing but ill-defined veneration of Christ's heart. This veneration was present in the belief that Christ's heart poured forth