Guy deMontgomery Count of Ponthieu
Guy deMontgomery Count of was born in 1118.  He died at the age of 29 in 1147.

 Ida de Saint Pol
Ida de was born in 1110.  She died at the age of 72 in 1182.

 Count John deMontgomery
John was born in 1143.  He died at the age of 49 in 1192.