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Guillaume Boulogne-Sur-Mer, De

Guillaume's father was Eustace II. Boulogne-Sur-Mer, De. His paternal grandfather was Eustace I. Boulogne-Sur-Mer, De and his paternal grandmother is Matilda Louvaine, De. He had four brothers named Balduin, Eustace III., Godfrey and Godfrey.

Ancestor Pedigree Chart
- Eustace I. Boulogne-Sur-Mer, De
  - d.1049
  
  Eustace II. Boulogne-Sur-Mer, De
  - d.1070
  
  Matilda Louvaine, De
  
  Guillaume Boulogne-Sur-Mer, De