Ermengarde de Tonnerre 
Ermengarde's father was Renaud de Tonnerre Ct of Tonnerre and her mother was Hawise (de Tonnerre). Her paternal grandparents were Milo II de Tonnerre Ct of Tonnerre and Ermengarde de Bar-sur-Seine. She was an only child. She died in 1085.1 
Details of Ermengarde's family with Guillaume I de Nevers Ct of Tonnerre
1 SUSANNA KEENE.FTW
Further sources/citations:
Elmore, Lorraine Ann "Lori" (Garner), Recipient: J.H. Garner, @ Courtenay, Ahnentafel for Margery Arundell, Recipient: J.H. Garner, Author @ d of Renaud de Tonnerre Ct de Tonnerre & Ervig
Further sources/citations:
Elmore, Lorraine Ann "Lori" (Garner), Recipient: J.H. Garner, @ Courtenay, Ahnentafel for Margery Arundell, Recipient: J.H. Garner, Author @ d of Renaud de Tonnerre Ct de Tonnerre & Ervig
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