Frederick Ponsonby, 3rd Earl of Bessborough, styled the Viscount Duncannon from 1758 to 1793, was an Anglo-Irish peer.
Lord Bessborough by Samuel William Reynolds.
Henrietta Frances Ponsonby, Countess of Bessborough, was the wife of Frederick Ponsonby, 3rd Earl of Bessborough; the couple were the parents of Lady Caroline Lamb. Her father, John Spencer, 1st Earl
Frederick Ponsonby, 3rd Earl of Bessborough
…his succession to his father's earldom. He was a Lord of the Admiralty in 1782–1783. On 27 November 1780, Duncannon married the intelligent and kind Lady Henrietta Spencer, second daughter of John Spencer, 1st Earl Spencer. Duncannon and Harriet had four children: John Ponsonby, 4th Earl of Bessborough (1781–1847); married…
Portrait by Angelica Kauffman, 1793
Lady Georgiana Spencer, Henrietta Spencer and George, Viscount Althorp, by Angelica Kauffman, c. 1766
Henrietta Ponsonby with her sons Frederick and John, by John Hoppner (1787)