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Male Chatelain William de St. Omer III Click to view Chatelain William de St. Omer III in the family tree

William was born in St. Omer, France.  William's father was William de St. Omer II and his mother is Melisinde de Picquigny.  His paternal grandfather was Chatelain William de St. Omer I and his paternal grandmother is Aganitrude von Brugge; his maternal grandfather is Arnoul de Picquigny. He had a sister named Maude.  He died in 1170.


William's family with Mathilde

‌William and Mathilde were married in a religious ceremony in France.  They had a son named William.

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