Henry De Percy
Henry was born on March 25th, 1273.  He died at the age of 41 on October 2nd, 1314.

 Eleanor Fitzalan
Eleanor was born in 1277.  She died at the age of 51 in July 1328.

 Henry III De Percy
Henry III was born on February 6th, 1300.  He died at the age of 51 on February 25th, 1351.

 William De Percy
William was born in 1301.  He died at the age of 54 in 1355.