SOURCE-08638Research NeededProbable
Cawley, Charles, and Foundation of Medieval Genealogy. "Poitou-Western: Chapter ...
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Cawley, Charles, and Foundation of Medieval Genealogy. "Poitou-Western: Chapter 2A. Vicomtes de Thouars" in Medieval Lands: A Prosopography of Medieval European Noble and Royal Families; http://fmg.ac/Projects/MedLands/poitwest.htm#_Toc499880533 : accessed 27 October 2019.