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Male Guillaume I Long Normandy Click to view Guillaume I Long Normandy in the family tree

Guillaume I Long was born about 0893 in of, Normandy, France.1   Guillaume I Long's father was Robert and his mother was Poppa DeBayeaux.  His paternal grandparents were Rognvald "The More" and Hilda Ragnhild; his maternal grandparents were Berenger De Bayeaux and Mrs-Berenger De Bayeaux. He had a brother and a sister, named Count Of CORBEILL and Adele.  He was the oldest of the three children.  He died in France.2 

Family Details of Guillaume I Long's family with Sporte DeBretagne

Family Details of Guillaume I Long's family with Ledgarde Duchess Of Normandy

1 basel.FTW
2 phelps1609.FTW
Further sources/citations:
World Family Tree Vol. 9, Ed. 1 @ Tree #2571, World Family Tree Vol. 16, Ed. 1 @ Tree #1609