Bouchard d'Avesnes & Countess of Flanders & Hainault Margaret of Flanders 
They had a son named Jean.
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Personal Details
Bouchard d'Avesnes
Bouchard was born in 1180.1 He died at the age of 64 in 1244 in Entraeungt, Nord, France.1
Countess of Flanders & Hainault Margaret of Flanders
Margaret was born on June 2nd, 1202 in Valenciennes, Nord, France.2 She died at the age of 76 on February 10th, 1279. She was buried in Flines-Laes-Mortagne, Nord, France.2 1
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Children
Count of Hainault Jean de Avesnes of Flanders I
Jean was born on May 1st, 1218 in Etraeunt, Nord, France.3 He died at the age of 39 on December 24th, 1257 in Valenciennes, Nord, France.3
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I23049&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I10528
3 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I4243&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I10528
3 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I4243&style=TABLE