John Courtenay
John was born in 1218.  He died at the age of 56 on May 3rd, 1274.

 Isabel De Vere
Isabel was born in 1222.  She died after February 1298.

 Hugh Courtenay
Hugh was born on March 25th, 1249.  He died at the age of 41 on February 28th, 1291.