Ingeborg of Denmark, queen of France. [Letter to Celestine III, pope, 1196] in Recueil des historiens des Gaules et de la France 19: 320

[Letter from Ingeborg of Denmark, queen of France, to Pope Celestine III]
After Ingeborg’s earlier letter (), the pope reproached the French prelates for granting the divorce and rescinded it, telling them to forbid the king to remarry, but the king intimidated the prelates and married Agnes of Meran. Ingeburg’s brother asked the pope to put France under interdict, and Philip removed the queen from the abbey and imprisoned her in a fortress three days journey from Paris.
Online at Epistolae (See also Bibliographia record).