Ingeborg of Denmark, queen of France. [Letter to Innocent III, Pope] in Recueil des historiens des Gaules et de la France 19: 428-29

[Letter from Ingeborg of Denmark, queen of France, to Pope Innocent III]
After Pope Innocent III placed Philip's kingdom under interdict, Philip received the queen and formally gave her his hand at St. L├ęger in Iveline, but refused to resume marital relations with her. Ingeborg was transferred to Etampes and her life was worse than before, as she laments in striking detail in this letter to the pope. She also warns him not to accept any statement she may be compelled by fear to make against her own interests, as Philip pressured her to ask for a divorce.
Online at Epistolae (See also Bibliographia record).