Edmund Plantagenet
Edmund was born in 1341.  He died at the age of 61 in 1402.

 Isabella UNKNOWN
Isabella was born in 1355.  She died at the age of 37 in 1392.

 Constance Plantagenet
Constance was born in 1374 in Conisbrough, Yorkshire, England.  She died at the age of 42 on November 28th, 1416 in Reading, Berkshire, England.