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Male Guelph IV Este Duke of Bavaria Click to view Guelph IV Este Duke of Bavaria in the family tree

Guelph IV was born about 1035 in <Este,Tuscany,Florence,Italy>.1   He was an only child.  He died on November 9th, 1091.1 

Guelph IV's first family with Ethelinda Wettin

‌Guelph IV and Ethelinda were married in a religious ceremony about 1062.1 


Guelph IV's second family with Judith Fleming Countess of Northumbria

‌Guelph IV and Judith were married in a religious ceremony in 1071 in <,Flanders,Belgium,Netherlands>.1   They had two sons and a daughter, named Welf V, Heinrich IX and Ida.

1 "Genealogical Research of Kirk Larson"
Further sources/citations:
"Héraldique européenne", "Geocities Web Site: Hohenlohe Ancestry", "FamilySearch® Ancestral File™ v4.19"

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