About 1st wife of Ermenfroi
- Weis, Frederick Lewis, Walter Lee Shepard, William R. & Kaleen E. Beall, Ancestral Roots of Certain American Colonists Who Came to America before 1700 - 8th and Earlier Editions, (Genealogical Publishing Co., Inc.; Baltimore MD; 2004; 359 pages). Page 236, line 250.
- Families, Friends, and Allies: Boulogne and Politics in Northern France and England, C. 879-1160 Heather J. Tanner BRILL, 2004 - History - 399 pages. Page 56. " ... Kinship also played a significant role in securing newly acquired territory. Ermenfroi and Raoul l de Gouy defended their country from the Northmen's raids and their neighbors through a marriage alliance and their fidelity to the king. (145). Raoul's marriage to Eldegarde, Ermenfroi's daughter or niece, secured Ermenfroi's counties to his grandchildren, and helped Raoul maintain his control over Ostrevant."