Nicholas "Plukiel" Seigneur d' Avesnes
Nicholas "Plukiel" Seigneur d' was born about 1129 in Oizy, Namur, Belgium.  He died about 1170 in Avesnes, Pas-de-Calais, France.

 Mahaut (Mathilda) Countess de la Roche
Mahaut (Mathilda) Countess de was born in 1133 in La Roche, Belgium.

 Adelaide d' Avesnes
Adelaide d' was born about 1152 in Avesnes, Pas-de-Calais, France.

 Jacques d' Avesnes
Jacques d' was born about 1155 in Avesnes, Pas-de-Calais, France.  He died on September 7th, 1191 in Near Arsoef, Palestine.

 Ida d' Avesnes
Ida d' was born about 1160 in Avesnes, Pas-de-Calais, France.