Fastre I de Oisy
Fastre I de was born about 1050 in Oizy, Namur, Belgium.  He died on June 8th, 1091.

 Ada\Ide de Avesnes
Ada\Ide de was born about 1054 in Avesnes, Pas-de-Calais, France.  Ada\Ide de is no longer alive.

 Fastre II de Oisy
Fastre II de was born about 1075 in Oizy, Namur, Belgium.  He died in 1111.