Guillaume I "de Ponthieu" de Boulogne
- Born: 915, Montreuil, Pas-de-Calais, Hauts-de-France, France
- Marriage (1): Maud Mathilde Marguerite de Gamaches
- Died: 980, Saint-Michel-sur-Ternoise, Pas-de-Calais, Hauts-de-France, France aged 65
FamilySearch ID: PSJL-D6F.
Guillaume married Maud Mathilde Marguerite de Gamaches, daughter of Adolphe de Boulogne Comte and Mahaut de Créquy. (Maud Mathilde Marguerite de Gamaches was born in 915 in Gamaches, Somme, Hauts-de-France, France and died in 959 in Abbeville, Somme, France.)
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