William De II St. Omer
William De II was born about 1090 in St Omer, Pas-De-Calais, France.  He died about 1143.

 Melisende De Picquigny
Melisende was born about 1090 in Picquigny, Picardy, France.

 William De III St. Omer
William De III was born about 1120 in St. Omer, France.  He died in 1170.