I Eustache , Count De Boulogne
I was born about 1004 in Boulogne, France.

 Mahaut Of Louvain
Mahaut Of was born about 0984 in Louvain, Belgium.

 Lambert De Boulogne
Lambert was born about 1020 in Boulogne, France.  He died in 1054 in Flandres, Belgium.

 II Eustache , Count De Boulogne
II was born about 1030 in Boulogne, France.  He died about 1093.