William Ponsonby, 1st Baron Ponsonby

The Right Honourable The Lord Ponsonby of Imokilly PC (Ire)
Joint Postmaster General of Ireland
In office 1784–1789
Monarch	George III
Succeeded by	The Earl of Bellomont
Parliamentary offices Member of the House of Lords Lord Temporal Hereditary peerage 13 March 1806 – 5 November 1806 Preceded by Newly created Succeeded by John Ponsonby County Kilkenny (United Kingdom) In office 1801–1806 Preceded by New constituency Succeeded by Hon. George Ponsonby County Kilkenny (Ireland) In office 1783–1801 Preceded by Hon. John Ponsonby Succeeded by Parliament of the United Kingdom Newtownards In office 1783–1783 Preceded by Sir John Browne, 7th Bt Succeeded by Hon. John Ponsonby Bandonbridge In office 1776–1783 Preceded by Francis Bernard Succeeded by Francis Bernard Cork City In office 1764–1776 Preceded by Sir John Freke, 3rd Bt Succeeded by Richard Longfield
Personal details
Born	William Brabazon Ponsonby (1744-09-15)15 September 1744 Dublin, Ireland
Died	6 November 1806(1806-11-06) (aged 62) London, England
Spouse	Louisa Molesworth m. 1769 d. 1824
Children	John Ponsonby, 1st Viscount Ponsonby of Imokilly Sir William Ponsonby Richard Ponsonby George Ponsonby Frederick Ponsonby Mary Grey, Countess Grey
Parent(s)	John Ponsonby Elizabeth Cavendish
Occupation	Politician

William Brabazon Ponsonby, 1st Baron Ponsonby (of Imokilly), PC (Ire) (15 September 1744 – 5 November 1806) was a leading Irish Whig politician, being a member of the Irish House of Commons, and, after 1800, of the United Kingdom parliament.^[1] Ponsonby was the son of the Hon. John Ponsonby, the Speaker of the Irish House of Commons and Lady Elizabeth Cavendish, daughter of the 3rd Duke of Devonshire. He was invested as a Privy Counsellor of Ireland in 1784. He served as Joint Postmaster-General of Ireland (1784–1789).