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Male Guilluame I de Ponthieu Click to view Guilluame I de Ponthieu in the family tree

Guilluame I's father was Herbouin II de Ponthieu.  His paternal grandfather was Helgaud III de Ponthieu.  He was an only child.  Guilluame I is no longer alive.


Guilluame I's family

He had a biological son named Hildouin III.

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