Enguerrand II De Ponthieu
Enguerrand II was born about 1020 in Normandy, France.  He died in 1053.

 Adeliza De Normandy
Adeliza was born in 1026 in Falais, Calvados, France.  She died before 1090.

 Peter Seigneur De Valoines
Peter Seigneur was born about 1040 in Valognes, Cotentin, France.  He died after 1107.

 Helisende De Ponthieu
Helisende was born before 1052.