Guillaume Ier De Ponthieu 
Guillaume Ier was born in 0920. Guillaume Ier's father was Herbouin II Ou Hélouin De Ponthieu and his mother was ? De Dammartin. His paternal grandfather was Helgaud III De Ponthieu. He had a brother named Roger Ier Ou Rotgaire. He was the older of the two children. He died at the age of 60 in 0980.General Notes
#Générale# Comte de Ponthieu.
Certaines sources donnent Rotgaire de MONTREUIL mor t vers957
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Ancestor Pedigree Chart
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*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
- b.0775
- b.0805 d.0863
- b.0830 d.0878
- b.~ 0750 d.18 FEB 814
- b.0805 d.< 0859
- b.0779 d.14 JAN 823
- b.0860 d.0926
- b.0835 d.0870
- b.0890 d.13 JUL 945 in , Bayeux, 14,
- b.0920 d.0980
- b.~ 0895
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He had a biological son named Hildouin III.
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