However, although the earldom went extinct in 1802 with the death of the 7th Earl of Mountrath, the subsidiary title of Baron Castle Coote passed by special remainder and remained extant (until 1827).
[1] The first Baron represented County Cork and then Marylebone in the British House of Commons, taking the Chiltern Hundreds the day the spurious 1855 patent was issued.
His younger son, the third Baron, sat as an Irish nationalist Member of Parliament for Kerry East.
Diana, Princess of Wales, was a great-great-granddaughter of the 1st Baron Fermoy through her mother, Frances Shand Kydd.
Shand Kydd was the younger daughter of the 4th Baron Fermoy, a friend of King George VI and the elder of the twin sons of the American heiress Frances Ellen Work and her first husband, James Boothby Burke Roche, who, after their divorce, became the 3rd Baron Fermoy.