Guillaume I de PONTHIEU & Maud de St Pol sur Mer de THEROUANNE 
They had a son named Hilduin de.
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Personal Details
Guillaume I de PONTHIEU
Guillaume I de was born about 0915 in Ponthieu, Ain, France. He died in 0979.
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Children
Hilduin de PONTHIEU, Comte de Montreuil
Hilduin de was born about 0934 in Ponthieu, Ain, France. He died in 0981 in Normandie, France.