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Male Guelph I (Welf) of Bavaria Ct de Altdorf Click to view Guelph I (Welf) of Bavaria Ct de Altdorf in the family tree

Guelph I (Welf) of Bavaria was born in 1040.1   Guelph I (Welf) of Bavaria's father was Azo II de Este Mar de Este and his mother was Cunegunda of Bavaria.  His maternal grandparents were Guelph (Wolfard) of Altdorf Ct de Altdorf and Jutta (Imagi) de Luxemburg.  He was an only child.  He died at the age of 61 on November 9th, 1101 in Paphos, Cyprus.1 

Family Details of Guelph I (Welf) of Bavaria's family with Judith (Fausta) de Flanders

1 large-G675.FTW @ line 132A pp 116-117
Further sources/citations:
large-G675.FTW, large-G675.FTW, large-G675.FTW

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