William, abbot of St. Thomas of the Paraclete. [Letter to Ingeborg of Denmark, queen of France, 1195] in Recueil des historiens des Gaules et de la France 19: 315

[Letter from abbot William of St. Thomas of the Paraclete to Ingeborg of Denmark, queen of France]
William excuses himself for not coming in person but sends a letter of sympathy, consolation, and encouragement for Ingeborg in her just struggle.
Online at Epistolae (See also Bibliographia record).