Seigneur Gossuin de Mons I
Gossuin was born about 1050 in Mons, Hainault, Belgium.  He died before 1088.

 Ermengarde de Chaumont
Ermengarde was born in Chaumont, Loire, France.  She died after 1088.

 Hildegarde of Mons
Hildegarde was born about 1080 in Mons, Hainault, Belgium.