Bertrand (Rasse IV) Sire de Gavre
Bertrand (Rasse IV) Sire de was born about 1120 in Gavere, Flandre-Orientale, Belgium.  He died in 1150.

 Ida Domnison de Chievres
Ida Domnison de was born about 1124 in Chievres, Hainault, Belgium.  She died in 1176.

 Bertha de Gavre
Bertha de was born about 1144 in Gavere, Flandre-Orientale, Belgium.