Guillaume was the son of Arnould I de Guînes and Mahaut de Saint-Omer. The date and place of his birth have not been found.
His wife was Flandrine de Saint-Pôl. They were married, but the date and place have not been found. They had no known children.
Arnould I de Guînes |
Wenemar I de Gand |
Lambert II de Gand |
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Baudouin I de Guînes |
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Adèle Chrétienne van Holland |
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Mahaut de Saint-Omer |
Guillaume II |
Guillaume I |
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Mélissende de Picquigny |
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Note 1
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