Count Eustache I deBoulogne
Eustache I was born in 0997.  He died at the age of 52 in 1049.

 Matilda deLouvain
Matilda was born in 1004.

 Lambert deBoulogne II Count of Lens
Lambert deBoulogne II Count of was born in 1020.  He died at the age of 34 in 1054.

 Eustache II Count of Boulogne
Eustache II Count of was born in 1023.