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William I De Ponthieu & Maud De St Pol

They had a son named Hildouin.

Personal Details
- William I De Ponthieu
  William I was born in Ponthieu, Somme, Picardie, France. He died in Ponthieu, Somme, Picardie, France.
  
  Maud De St Pol
  Maud was born in Maer, Norway. She died in , , , France.

Children
- Hildouin Ponthieu
  Hildouin was born in 1010 in Ponthieu, Ain, Rhone-Alpes, France. He died at the age of 53 in 1063 in Ponthieu, Somme, Picardie, France.