Guillaume was the son of Guillaume de Boulogne but his mother is unknown. The date and place of his birth have not been found.
His wife was Béatrix de Guînes. They were married, but the date and place have not been found. They had no known children.
Guillaume de Boulogne |
Geoffroy Fitz Eustache |
Eustache II de Boulogne |
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Béatrice de Mandeville |
Geoffroy I de Mandeville |
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Adélize de Balts |
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