Gérard De Wassemberg
Gérard was born about 1075.  He died in 1128.

 Oda Ou Irmengarde De Walbeck
Oda Ou Irmengarde was born about 1083.  Oda Ou Irmengarde is no longer alive.

 Goswin II De Wassemberg
Goswin II was born in 1107.  He died at the age of 61 on April 8th, 1168.