Hugh I de Mortaigne
Hugh I was born in 0940.  He died at the age of 49 in 0989.

 Hildegarde of Blois
Hildegarde of was born after 0944.  She died in 1008.

 Geoffrey II de Mortaigne
Geoffrey II was born in 0975.  He died at the age of 56 on December 15th, 1031.