Hildegard of Bingen’s correspondence was one of the largest letter collections of her age, with nearly 400 entries. Her correspondents stretch across nearly the whole of the religious and social hierarchy, from popes and the Holy Roman Emperor to common monks and nuns. Written in her distinctive visionary style, her letters nevertheless are important historical sources for details of her life and times. They demonstrate her interest in Church reform and her reputation as a divinely inspired prophet who could provide guidance and consolation. Their manuscript transmission reveals how Hildegard and her secretaries edited the collection to establish and enhance her visionary authority.