Guillaume de Montfort, also known as Guillaume of Hainaut, was a French nobleman of the end of the 10th century, the first Lord of Montfort-l'Amaury.
He was succeeded as Lord of Montfort-l'Amaury by his son Amaury I de Montfort.
Guillaume is possibly the son[1][2] of Amaury, Count of Valenciennes.
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