Agnes d'Harcourt was the daughter of Juan d'Harcourt. She became a nun and joined the convent at Longchamp, serving alongside the abbey's founder, Isabelle of France. In 1263, d'Harcourt was appointed abbess, and served as such until her death in November, 1291. During her time as abbess, d'Harcourt wrote Life of Isabella, the biography of her friend, colleague, and eventual saint, Isabelle. The book is considered one of the "most valuable works of the early French writer."
- Field, Sean L. The Writings Of Agnes Of Harcourt: The Life of Isabelle of France and the Letter on Louis IX and Longchamp. South Bend: University of Notre Dame Press (2003). ISBN 0-268-04404-X
- The ladies' cabinet of fashion, music & romance. Oxford: Oxford University (1840): 329-330
- Henry Gardiner Adams (1857). A cyclopaedia of female biography: consisting of sketches of all women who have been distinguished by great talents, strength of character, piety, benevolence, or moral virtue of any kind. Groombridge. p. 368. Retrieved 17 December 2011.
- "Agnes D'Harcourt". Elizabeth A. Sackler Center for Feminist Art: The Dinner Party: Heritage Floor: Agnes D'Harcourt. Brooklyn Museum. 2007. Retrieved 17 December 2011.
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