William Ponsonby, 1st Viscount Duncannon (1659 – 17 November 1724), was an Anglo-Irish peer. He was born in 1659, the third son of Sir John Ponsonby (c...

the Peerage of Ireland. It was created in 1739 for Brabazon Ponsonby, 2nd Viscount Duncannon, who had previously represented Newtownards and County Kildare...

Parliament William Ponsonby, 1st Baron de Mauley (1787–1855), British Member of Parliament for Poole, Knaresborough and Dorset William Ponsonby, 1st Viscount Duncannon...

Sarah Margetson Colvill. He was the grandson of William Ponsonby, 1st Viscount Duncannon. In 1739, Ponsonby entered the Irish House of Commons for Newtownards...

Ponsonby, 1st Earl of Bessborough (1679 – 4 July 1758), was a British politician and peer. He was the son of William Ponsonby, 1st Viscount Duncannon...

Harriet married Frederick Ponsonby, 3rd Earl of Bessborough, an Anglo-Irish nobleman who was at the time the Viscount Duncannon and later became the 3rd...

Frederick Ponsonby, 3rd Earl of Bessborough DCL (24 January 1758 – 3 February 1844), styled the Viscount Duncannon from 1758 to 1793, was an Anglo-Irish...

John William Ponsonby, 4th Earl of Bessborough, PC (31 August 1781 – 16 May 1847), known as Viscount Duncannon from 1793 to 1844, was a British Whig politician...

and member of the House of Lords (styled Hon. William Ponsonby from 1723 to 1739 and Viscount Duncannon from 1739 to 1758). He served in both the Irish...

Henry William Lamb, 2nd Viscount Melbourne PC, PC (Ire), FRS (15 March 1779 – 24 November 1848) was a British Whig politician who served as the Home Secretary...