Robert de Mortimer
Robert was born in 1246 in Richard's Castle, Hampshire, England.  He died at the age of 41 on April 7th, 1287.

 Joyce La Zouche
Joyce was born about 1250 in Kings Nympton, Devonshire, England.  She died in Norton, Northamptonshire, England.

 Baron Hugh de Mortimer
Hugh was born about 1271 in Richard's Castle, Hampshire, England.  He died on July 20th, 1304.

 Sir William la Zouche de Mortimer
William la Zouche was born before 1300.