William de Burgh, 3rd Earl of Ulster
William was born on September 17th, 1312.  He died  due to murdered at the age of 20 on June 6th, 1333.

 Lady Matilda of Lancaster (Plantagenet)
Matilda was born about 1310.  She died before May 5th, 1377.

 Elizabeth de Burgh
Elizabeth was born on July 6th, 1332.  She died at the age of 31 on December 10th, 1363.