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Agnes, Countess of Aix-en-Berry (fl. 1080–1120) was a medieval healer and the first prioress of the Orsan Priory.

Agnes was the first wife of Alard de Guillebaud, lord of Châteaumeillant; when the marriage was dissolved by reason of consanguinity, Agnes retired to Fontevraud Abbey. In 1107, Alard donated lands for the foundation of a Fontevrist monastery near Orsan (modern Maisonnais) to Robert of Arbrissel at the urging of Leger, Archbishop of Bourges; Agnes became the first prioress of the resulting monastery. She was reputed to be a healer of considerable skill, and attended Robert on his death bed.

• Dalarun, Jacques (2006). Robert of Arbrissel: Sex, Sin, and Salvation in the Middle Ages. Catholic University of America Press. ISBN 978-0813214399.
• Ogilvie, Marilyn; Harvey, Joy, eds. (1999). Biographical Dictionary of Women in Science: Pioneering Lives From Ancient Times to the Mid-20th Century. Routledge. ISBN 978-0415920407.
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