William de Fiennes
William was born in 1245.  He died at the age of 57 on July 11th, 1302.

 Blanche de Brienne
Blanche was born in 1245.  She died at the age of 57 in 1302.

 Margaret de Fiennes
Margaret was born in 1262.  She died at the age of 71 on February 7th, 1333.