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.
Rupert Ponsonby, 7th Baron de Mauley Rupert Charles Ponsonby, 7th Baron de Mauley {'1': ", '2': ", '3': ", '4': "} (born 30 June 1957) is a British hereditary peer, Parliamentary Under-Secretary at the Department for Environment, Food and Rural Affairs and retired Territorial Army officer.