Isabella outlived all her children, so after her death in 1293 her inheritance was disputed between Warin de Lisle and Hugh de Courtenay, who later became 9th Earl of Devon.
Devon | 9th United States Congress | James Earl Jones | Hugh Masekela | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Herbert Kitchener, 1st Earl Kitchener | Hugh Jackman | Hugh Grant | Earl | Frederick Roberts, 1st Earl Roberts | Earl of Derby | Earl Warren | Hugh Laurie | Earl of Pembroke | Robert Harley, 1st Earl of Oxford and Earl Mortimer | Earl of Warwick | Hugh Hefner | Thomas Wentworth, 1st Earl of Strafford | Hugh | Edward Smith-Stanley, 14th Earl of Derby | Earl of Shrewsbury | William Pitt, 1st Earl of Chatham | Simon de Montfort, 6th Earl of Leicester | Hugh O'Brian | Devonport, Devon | Tiverton, Devon | Richard Neville, 16th Earl of Warwick | Earl of Leicester | John Scott, 1st Earl of Eldon |
Sir Edward de Courtenay (c.1385 – 1418), who married, before 20 November 1409, Eleanor Mortimer, second daughter of Roger Mortimer, 4th Earl of March by Eleanor Holland, daughter of Thomas Holland, 2nd Earl of Kent.