Field reinterprets Isabelle's career as a Capetian princess. Isabelle was remarkable for choosing a life of holy virginity and for founding and co-authoring a rule for the Franciscan abbey of Longchamp. Isabelle did not become a nun there, but remained a powerful lay patron, living in a modest residence on the abbey grounds. Field maintains that Isabelle was a key actor in creating the aura of sanctity that surrounded the French royal family in the thirteenth century, underscoring the link between the growth of Capetian prestige and power and the idea of a divinely ordained, virtuous, and holy royal family. Her contemporary reputation for sanctity emerges from a careful analysis of the Life of Isabelle of France written by the third abbess of Longchamp, Agnes of Harcourt, and from papal bulls, letters, and other contemporary sources that have only recently come to light.




