Count of Hainault Jean de Avesnes of Flanders I & Countess Aleidis of Hainault 
Jean and Aleidis were married in September 1246 in Frankfort Am Main, Hessen-Nassau, Prussia.1 They had two sons named Jan and Guy.
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Personal Details
Count of Hainault Jean de Avesnes of Flanders I
Jean was born on May 1st, 1218 in Etraeunt, Nord, France.2 He died at the age of 39 on December 24th, 1257 in Valenciennes, Nord, France.2
Countess Aleidis of Hainault
Aleidis was born in 1225 in Netherlands.2 She died at the age of 59 in 1284 in Valenciennes, Nord, France.2
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Children
Count of Flanders, Count of Hainault Jan Avesnes of Holland II
Jan was born in 1246 in Brabant, France.2 He died at the age of 58 on August 22nd, 1304 in Valenciennes, Nord, France.2
Guy de Avesnes
Guy was born in 1253 in Valenciennes, Nord, France.3 He died at the age of 64 on May 28th, 1317 in Utrecht, Netherlands.3
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I13560&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I4243&style=TABLE
3 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I32745&style=TABLE
Further source/citation:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=jdp-fam&id=I23050
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I4243&style=TABLE
3 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I32745&style=TABLE
Further source/citation:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=jdp-fam&id=I23050