 Gloucester 's political importance did not end with his death ; his disappearance from the political scene had immediate consequences . In his Welsh lordship of Glamorgan , the uncertain situation caused by his death caused a short @-@ lived rebellion in 1316 . In Ireland , where he also held large possessions , the power vacuum he left behind facilitated the 1315 invasion by Robert the Bruce 's brother Edward . The greatest consequences , however , resulted from the division of the de Clare estates . In 1308 , Gilbert de Clare had married Maud ( or Matilda ) de Burgh , the daughter of Richard de Burgh , Earl of Ulster . The couple left no surviving issue , so his death marked the end of the great de Clare family . The family lands were worth as much as £ 6 @,@ 000 , second only to those of the Earl of Lancaster among the nobility of the realm . 
