William Ponsonby, 1st Baron de Mauley

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William Francis Spencer Ponsonby, 1st Baron de Mauley (31 July 1787 – 16 May 1855) was an English Whig and Liberal politician who sat in the House of Commons between 1826 and 1837. He was raised to the Peerage in 1838.


Ponsonby was the youngest child of 3rd Earl of Bessborough and his wife Henrietta Ponsonby, Countess of Bessborough.[1]

Ponsonby was elected Member of Parliament for Poole in 1826 and held the seat until 1831.[2] He was then MP for Knaresborough between June and December 1832.[3] At the 1832 UK general election he was elected MP for Dorset and held the seat until 1837.[4] In 1838 he was created Baron de Mauley.

When the marriage of his sister Lady Caroline Lamb to William Lamb, 2nd Viscount Melbourne, began to break up, he strongly supported Caroline.[5] Unfortunately he was not noted for tact or intelligence—Melbourne's sister Emily Lamb, Lady Cowper, described him as universally regarded as "an ass and a jackanapes".[5] Ponsonby reminded Melbourne that the Lamb family were socially parvenu, and that his sister had married beneath her; although true, these remarks were so tactless that Melbourne broke off any further dealings with him.[5]


On 8 August 1814, Ponsonby married Lady Barbara Ashley-Cooper (the only daughter and heir of the 5th Earl of Shaftesbury and a co-heir of the medieval Barony of Mauley, 1789-1844). They had three children:[1]


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Parliament of the United Kingdom
Preceded by
Benjamin Lester
John Dent
Member of Parliament for Poole
With: Benjamin Lester 1809-1835
Succeeded by
Benjamin Lester
Sir John Byng
Preceded by
Hon. Henry Cavendish
George Tierney
Member of Parliament for Knaresborough
Jun-Dec 1832
With: Hon. Henry Cavendish 1830–1832
Succeeded by
John Richards
Benjamin Rotch
Preceded by
Edward Portman
Lord Ashley
Member of Parliament for Dorset
Served alongside: Lord Ashley 1831–1846
William Bankes 1832–35
Henry Sturt 1835–1846
Succeeded by
Lord Ashley
John Fox-Strangways
Henry Sturt
Peerage of the United Kingdom
New creation Baron de Mauley
Succeeded by
Charles Ponsonby