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Hildegard of Bingen  (German: Hildegard von Bingen; Latin: Hildegardis Bingensis; 1098 - 17 September 1179), also known as Saint Hildegard and Sibyl of the Rhine, was a German Benedictine abbess, writer, composer, philosopher, Christian mystic, visionary, and polymath. She is considered to be the founder of scientific natural history in Germany. Hildegard was elected magistra by her fellow nuns in 1136; she founded the monasteries of Rupertsberg in 1150 and Eibingen in 1165. One of her works as a composer, the Ordo Virtutum, is an early example of liturgical drama and arguably the oldest surviving morality play.

Maddocks claims that it is likely Hildegard learned simple Latin and the tenets of the Christian faith but was not instructed in the Seven Liberal Arts, which formed the basis of all education for the learned classes in the Middle Ages: the Trivium of grammar, dialectic, and rhetoric plus the Quadrivium of arithmetic, geometry, astronomy, and music. The correspondence she kept with the outside world, both spiritual and social, transcended the cloister as a space of spiritual confinement and served to document Hildegard's grand style and strict formatting of medieval letter writing.  Contributing to Christian European rhetorical traditions, Hildegard "authorized herself as a theologian" through alternative rhetorical arts. Hildegard was creative in her interpretation of theology. She believed that her monastery should exclude novices who were not from the nobility because she did not want her community to be divided on the basis of social status. She also stated that "woman may be made from man, but no man can be made without a woman."  Because of church limitation on public, discursive rhetoric, the medieval rhetorical arts included preaching, letter writing, poetry, and the encyclopedic tradition. Hildegard's participation in these arts speaks to her significance as a female rhetorician, transcending bans on women's social participation and interpretation of scripture. The acceptance of public preaching by a woman, even a well-connected abbess and acknowledged prophet, does not fit the stereotype of this time. Her preaching was not limited to the monasteries; she preached publicly in 1160 in Germany. (New York: Routledge, 2001, 9). She conducted four preaching tours throughout Germany, speaking to both clergy and laity in chapter houses and in public, mainly denouncing clerical corruption and calling for reform.  Many abbots and abbesses asked her for prayers and opinions on various matters. She traveled widely during her four preaching tours. She had several fanatical followers, including Guibert of Gembloux, who wrote to her frequently and became her secretary after Volmar's death in 1173. Hildegard also influenced several monastic women, exchanging letters with Elisabeth of Schonau, a nearby visionary.  Hildegard corresponded with popes such as Eugene III and Anastasius IV, statesmen such as Abbot Suger, German emperors such as Frederick I Barbarossa, and other notable figures such as Saint Bernard of Clairvaux, who advanced her work, at the behest of her abbot, Kuno, at the Synod of Trier in 1147 and 1148. Hildegard of Bingen's correspondence is an important component of her literary output.

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Hildegard of Bingen