- Ida of Lorraine
Daughter of Duke Godfrey IV of Lorraine. Descendent of Blessed Charlemagne. Married Count Eustace II of Boulogne at age 17. Mother of Godfrey and Baldwin de Bouillon. Widow. Endowed several monasteries in Picardy (part of modern France). Benedictine oblate.
- Book of Saints, by the Monks of Ramsgate
- Katherine Rabenstein
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint Ida of Boulogne“. CatholicSaints.Info. 29 August 2009. Web. 26 August 2016. <>