Walter Gauthier I De Brienne
Walter Gauthier I was born about 1060.  He died in 1090.

 Eustache De Bar-Sur-Seine
Eustache was born in 1050.  She died at the age of 35 in 1085.

 Erard I De Brienne
Erard I was born about 1079 in France.  He died in 1114.