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

 Ada or Ida D'Avesnes
Ada or Ida was born about 1054 in Avesnes, France.  Ada or Ida is no longer alive.

 Fastre II De Tournai
Fastre II was born in Oizy, Namur, Belgium.  He died in 1111 in Avesnes, France.