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Male Guillaume I De Montferrat Marquis Click to view Guillaume I De Montferrat Marquis in the family tree

Guillaume I was born about 0990 in , , , Normandy.  Guillaume I's father was Otto I De Montferrat Marquis and his mother is () Von Piacenza.  His paternal grandfather was Aleramo I De Montferrat Marquis and his paternal grandmother is Gerberge Of Italy; his maternal grandfather is Riprand Von Piacenza.  He was an only child.  He died about 1031.  He was buried about 1031.


Guillaume I's family with Uvaza ()

They had a son named Boniface I.

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