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The lineage presented is not complete. I know of one other issue of Baldwin IV de Hainaut and Adelheid de Namur; their son, William (Guillaume) de Hainaut who maried Mahaut de Lalaing. I am adding William. ( Cfaustus ( talk) 06:15, 3 February 2008 (UTC)) reply

There is also possibly a son Henry, however I am unable to find any dates (birth or death) for him. ( Cfaustus ( talk) 06:26, 3 February 2008 (UTC)) reply