St. Gertrude, also known as Saint Gertrude the Great, was a 13th-century Benedictine nun and mystic from Germany. She is celebrated for her deep spirituality and theological writings, particularly her work "The Herald of Divine Love," which reflects her devotion to Jesus Christ and the Holy Trinity. Gertrude's insights into the nature of God's love and mercy have made her an important figure in Christian mysticism. She is recognized as the patron saint of cats and is often depicted with a cat in art. Her feast day is celebrated on November 16, and she is venerated in both the Roman Catholic Church and the Eastern Orthodox Church. Gertrude's life and teachings continue to inspire many in their spiritual journeys.