In which year did this British peer and politician whose daughter was Henrietta Ponsonby, Countess of Bessborough pass away?
Henrietta Ponsonby, Countess of Bessborough Henrietta Ponsonby, Countess of Bessborough (16 June 1761 – 11 November 1821), born Lady Henrietta Frances Spencer (generally called Harriet), was the wife of Frederick Ponsonby, 3rd Earl of Bessborough, and mother of the notorious Lady Caroline Lamb. Her father, John Spencer, 1st Earl Spencer, was a great-grandson of John Churchill, 1st Duke of Marlborough. Her sister was Georgiana Cavendish, Duchess of Devonshire.
William Ponsonby (British Army officer) Major-General Sir William Ponsonby {'1': ", '2': ", '3': ", '4': "} (13 October 177218 June 1815), styled The Honourable from 1806, was an Irish politician and British Army officer who served in the Peninsula War and was killed at the Battle of Waterloo.