In which year did this British peer and politician whose daughter was Henrietta Ponsonby, Countess of Bessborough pass away?
John Spencer, 1st Earl Spencer John Spencer, 1st Earl Spencer (19 December 1734 – 31 October 1783) was a British peer and politician.
John Ponsonby, 1st Viscount Ponsonby John Ponsonby, 1st Viscount Ponsonby, GCB (1770 – 22 February 1855) was a longtime British diplomat and politician.