Conceptualizing Hildegard of Bingen as a theologian has been impeded by a pervading focus on her visionary status. The author provides a fruitful reassessment of Hildegard’s theology by contextualizing her writings along three coordinates: the authoritative texts she cites, the institutional environment in which theological discussion takes place, and the audience to whom the theology is directed. Her responsibility as magistra of her community led her to construct her trilogy of visions – Scivias, Liber vitae meritorum, and Liber divinorum operum – not just as visionary writings for the broader church but as a structured theological system to aid her nuns pedagogically. Analysis of her writings reveals a systematic methodology of theological instruction, including her use of classical rhetoric; additionally, her concerns for her nuns’ spiritual welfare are reflected in a customized presentation of theological topics. Ultimately, understanding Hildegard’s theology as a direct response to her immediate community reframes it and highlights its similarities to twelfth-century methods of theological instruction.

This chapter explores the development and purpose of the illustrations in two manuscripts of Hildegard of Bingen’s works: one designed by Hildegard (the Rupertsberg Scivias), the other designed by a later generation of her monastery’s nuns (the Lucca Liber divinorum operum). An overview of her visionary experiences demonstrates the prophetic mission of their detailed images to communicate theological truths. The author argues that Hildegard designed the Scivias images to aid that communication and provide visual exegesis of her visions, serving as a teaching tool to guide the reader through the manuscript. The next generation of nuns followed Hildegard’s impulse to illustrate her visions with the later Liber divinorum operum manuscript, but its famous cosmological diagram diverges from the text because the designer did not understand its meaning. The chapter closes with an assessment of the very limited influence of Hildegard’s illustrations in the later Middle Ages, with one story from the preaching of Johannes Tauler demonstrating their liability to reinterpretation.

This chapter argues that composing and singing plainchant for the medieval liturgy was enhanced by the creative practice of intertextuality, the citation and referencing of other textual and musical sources. For Hildegard of Bingen, one of the few medieval composers whose plainchants are firmly attributable, this was no exception. This chapter contextualizes the use of her musical compositions in medieval liturgical practice and establishes their interconnectedness with her own works and those of others. The author compares manuscript layout, presentation, and ordering of her plainchants with standard presentations of music in medieval liturgical manuscripts and discusses their liturgical function. Hildegard’s writings about music are considered, in terms of crossover of musical texts and themes within her output as well as her intertextual use of other sources, including biblical passages and Boethius’ De Institutione Musica. Finally, this chapter examines Hildegard’s practice of musical intertextuality through quotation and referencing in her compositions of her own plainchants as well as melodic material from chants commonly used in Office feasts.