Writings of Agnes of Harcourt: Life of Isabelle of France and Letter on Louis IX and Longchamp
La Vie de Madame sainte Isabele, suer le roy saint Looys
A verified public-domain excerpt for this text is still being set. The folio is catalogued and linked below; an original Sub Rosa rendering will follow.
What it is
The earliest known extant work of French prose by a named woman, written by Agnes of Harcourt, third abbess of Longchamp, at the commission of Charles of Anjou (Louis IX's brother). The Life of Isabelle of France documents the princess's piety, her refusal of marriage, her founding of the Franciscan convent of Longchamp, and the devotional milieu of the Capetian royal household. An accompanying Letter to the royal family details Louis IX's personal involvement with and devotion to Longchamp. No medieval manuscript of the original Life survives; the text is known through later copies and Sean Field's Notre Dame University Press translation.
Why it still matters
Agnes's portrait of Isabelle as a laywoman pursuing holiness outside formal religious vows speaks directly to Christian lay spirituality today; Sean Field's modern English translation makes both texts accessible for personal devotional reading or discussion in spiritual direction.
Kept alongside
The Enseignements of Louis IX to his son Philip
Les Enseignements de saint Louis à son fils Philippe
Written in Louis IX's own hand for his eldest son and heir Philip (the future Philip III) around 1267–1268, three years before Louis died on crusade, these instructions address prayer, daily confession, devotion, justice, and the conduct of Christian kingship in a tone of direct paternal love. The text opens: 'To his dear eldest son Philip, greetings and paternal affection.' Although Joinville later incorporated a version into his Vie de saint Louis, scholars have established that Joinville substantially altered Louis's actual words; the primitive text was recovered and published by Henri-François Delaborde in the Bibliothèque de l'École des Chartes in 1912. As a first-person document of royal spirituality composed near the end of Louis's life, it has no peer in the Capetian corpus.
The Enseignements of Louis IX to his daughter Isabelle
Les Enseignements de saint Louis à sa fille Isabelle, reine de Navarre
A companion piece to the Enseignements for Philip, this shorter text was written by Louis IX for his daughter Isabelle, queen of Navarre (1241–1271), and is phrased throughout in the direct imperative: love God, pray daily, confess your sins, conduct yourself uprightly. Louis explains in the opening lines that he believed his instructions would be retained more willingly precisely because they came from him through love rather than from a schoolmaster. The text survives in multiple manuscripts and was edited from the records of the Société de l'Histoire de France. Together with the Enseignements for Philip, it shows Louis applying the same Franciscan-inflected spirituality to both his son's governance and his daughter's personal sanctification.
De eruditione filiorum nobilium (On the Education of Noble Children)
De eruditione filiorum nobilium
Commissioned by Queen Marguerite of Provence from the Dominican encyclopedist Vincent of Beauvais — who served as lector in theology at Royaumont Abbey near the royal court and enjoyed direct Capetian patronage — this was the first systematic pedagogical manual for noble children in the Latin West and the first to address the educational needs of noble women directly. Written to guide the tutors of Louis IX's own children, it grounds its pedagogy in virtue formation, habitual prayer, and scriptural study drawn from Augustine, Jerome, and Chrysostom. The work circulated beyond the court and influenced later medieval educational writing; Vincent conceived it as part of a larger projected work on the governance of the French realm. It survives in multiple manuscripts and has been critically edited from the University of Missouri manuscript tradition.