William I de Ponthieu
William I was born before 0930.  He died in 0965.

 Maud St. Pol Sur Mer de Therouanne
Maud St. Pol Sur Mer was born before 0933 in Maer, Nord Trondelag, Norway.  She died in 0965.

 Ernicule of Boulogne
Ernicule of was born before 0945.  He died in 0972.

 Hildouin de Ponthieu
Hildouin was born before 0965.  He died about 0981.