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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), http://fmg.ac/Projects/MedLands/AQUITAINE.htm#GuillaumeIPoitoudied963.
- [S336470] Wikipedia, (Online: https://en.wikipedia.org), "William III, Duke of Aquitaine," http://en.wikipedia.org/wiki/William_III,_Duke_of_Aquitaine.
"William III (915 - 3 April 963), called Towhead (French: Tête d'étoupe, Latin: Caput Stupe) from the colour of his hair, was the 'Count of the Duchy of Aquitaine' from 959 and Duke of Aquitaine from 962 to his death. He was also the Count of Poitou (as William I) from 935 and Count of Auvergne from 950. The primary sources for his reign are Ademar of Chabannes, Dudo of Saint-Quentin, and William of Jumièges."
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