William Cavendish KG PC

William Cavendish KG PC (1720 - 1764)

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William "4th Duke of Devonshire, Marquis of Hartington" Cavendish KG PC
Born in Hardick, Suffolk, Englandmap
Ancestors ancestors
Husband of — married [location unknown]
Descendants descendants
Died in Spa, Germanymap
Profile last modified | Created 18 Feb 2011
This page has been accessed 2,035 times.

Categories: Members of Parliament, Great Britain | Members of Parliament, Derbyshire | Privy Counsellors of Great Britain | British Prime Ministers | Lords Lieutenant of Ireland | Knights Companion of the Garter | Fellows of the Royal Society | Duke of Devonshire | Notables.

British Aristocracy
William Cavendish KG PC was a member of aristocracy in the British Isles.
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William Cavendish KG PC is Notable.
Preceded by
William Cavendish, 3rd Duke of Devonshire
Duke of Devonshire
Succeeded by
William Cavendish, 5th Duke of Devonshire
Preceded by
Thomas Pelham-Holles, 1st Duke of Newcastle
5th Prime Minister of Great Britain
November 1756-1757
Succeeded by
Thomas Pelham-Holles, 1st Duke of Newcastle


William Cavendish, 4th Duke of Devonshire, Knight of the Garter

William Cavendish was baptised on 1 June 1720, at St Martin’s in the Fields, Westminster.[1]

He was the eldest son of William Cavendish, third Duke of Devonshire, and his wife Catherine née Hoskins.[1]


In March 1748 William married Lady Charlotte Boyle, the only surviving daughter, and heir of Richard Boyle, third Earl of Burlington.[1] (Charlotte Elizabeth Boyle, 6th Baroness Clifford 1731–1754)

William and Charlotte had four children:

  1. William Cavendish, 5th Duke of Devonshire (1748–1811);
  2. Dorothy Cavendish (27 Aug 1750 – 3 Jun 1794) m. PM William Cavendish-Bentinck, 3rd Duke of Portland, through her, the 4th Duke of Devonshire is the great-great-great-great grandfather of Queen Elizabeth II;
  3. Lord Richard Cavendish (1752–1781);
  4. George Augustus Henry Cavendish, 1st Earl of Burlington, 2nd creation (1754–1834). Lord Burlington's grandson, the 2nd Earl of Burlington, would later inherit the Devonshire dukedom as 7th Duke of Devonshire.

William was elected as MP for Derbyshire in 1741. In June 1751, William took a seat in the Lords as Baron Cavendish and was soon after appointed to the Privy Council.[1]

William's father died in December 1755 and he acceded to the dukedom.[1]

William Cavendish Duke of Devonshire died on 2 October 1764, at Spa, the Austrian Netherlands (now Belgium).[1]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 Andrew Thompson, "William Cavendish Duke of Devonshire (Whig, 1756-1757)", History of government, GOV.UK, Crown copyright, 2015,https://history.blog.gov.uk/2015/01/14/william-cavendish-duke-of-devonshire-whig-1756-1757/, accessed 27 March 2015
  • Clifford Pedigree: Table Showing the Descent of the Barony of Clifford

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No known carriers of William's Y-chromosome or his mother's mitochondrial DNA have taken yDNA or mtDNA tests.

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Images: 1
William Cavendish Image 1
William Cavendish Image 1


On 28 Mar 2015 at 02:05 GMT Maryann (Thompson) Hurt wrote:

Hi John, is it ok if I add him to the UK project as well?

William is 24 degrees from Rosa Parks, 19 degrees from Anne Tichborne and 7 degrees from Victoria of the United Kingdom of Great Britain and Ireland on our single family tree. Login to find your connection.

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