Charlotte Boyle-Walsingham, 21st Baroness de Ros, was born 24 May 1769 in Castlemartyr, County Cork, Ireland to Robert Boyle-Walsingham (1736-1780) and Charlotte Hanbury-Williams (-1790) and died 9 January 1831 Stratford Place, London, Greater London, England, United Kingdom of unspecified causes. She married Henry FitzGerald (1761-1829) 3 August 1791 in Marylebone, Greater London, England, United Kingdom.
After petitioning King George III in 1790, she eventually (in 1806) was able to end the abeyance to the Barony of de Ros, the most ancient baronial title in England, in her favor. This was accomplished despite her being determined only one of the three co-heirs to the barony with only a twenty-five percent interest whereas another claimant, Sir Henry Hunloke, Bt., had a fifty percent interest and was the heir general of the elder of the two sisters from whom the claims were derived. No clear explanation for the award was given by the House of Lords except an inference that Charlotte came from (or at least had married into) a better family.