Lady Caroline Cavendish (1719-1760) (1719–1760) Parents William Cavendish, 3rd Duke of Devonshire Catherine Cavendish, Duchess of Devonshire Children Frederick Ponsonby, 3rd Earl of Bessborough Lady Charlotte Ponsonby Catherine Beauclerk, Duchess of St Albans Siblings Lord John Cavendish Lady Rachel Cavendish Lord Frederick Cavendish Lady Elizabeth Cavendish William Cavendish, 4th Duke of Devonshire Lord George Cavendish Partners William Ponsonby, 2nd Earl of Bessborough