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- [S336463] Medieval Lands: A prosopography of medieval European noble and royal families, Charles Cawley, (Online: The Foundation for Medieval Genealogy at http://fmg.ac/Projects/MedLands/, 20XX), "William VI of Angoulême" at http://bit.ly/2D8HkKI.
- [S422] Richard I (English Monarchs Series), John Gillingham, (New Haven: Yale University Press, 1999), 55.
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