William Francis Spencer Ponsonby 1st. Baron de Mauley
- Born: 31 Jul 1787, Cavendish Sq., LON
- Christened: 31 Aug 1787, Marylebone, LON
- Marriage: Lady Barbara Ashley-Cooper on 8 Aug 1814 in Marylebone, LON
- Died: 16 May 1855, St. James's Place, LON aged 67
- Buried: 23 May 1855, Hatherop, GLS
 Noted events in his life were:
• Education: Harrow School, Harrow, MDX.
William married Lady Barbara Ashley-Cooper, daughter of Anthony Ashley-Cooper 5th. Earl of Shaftesbury and Barbara Webb, on 8 Aug 1814 in Marylebone, LON. (Lady Barbara Ashley-Cooper was born on 19 Oct 1788, died on 5 Jun 1844 in Albemarle St. LON and was buried in Canford, DOR.)
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