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Male Baudouin Click to view Baudouin in the family tree

Baudouin was born about 0933 in Of, FLANDERS, France.1   Baudouin's father was Arnolph and his mother was Adele DeVermandois.  His paternal grandparents were II Baldwin and Alfthryth; his maternal grandparents were Herbert De Vermandois and Bertha De Morvois. He had a brother and three sisters, named Egbert, Elstrude, Hildegard and Ledgarde.  He was the second oldest of the five children. He had a half-sister named Elstrude.1 

Family Details of Baudouin's family with Matilda of Saxony

1 phelps1609.FTW
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #0574, 0574.ftw, phelps.FTW @ Tree #1353, World Family Tree Vol. 9, Ed. 1 @ Tree #2571, basel.FTW, World Family Tree Vol. 2, Ed. 1 @ Tree #2013, 2013.ftw, World Family Tree Vol. 16, Ed. 1 @ Tree #1609