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William Henry Cavendish Cavendish-Bentinck, 3rd Duke of Portland

His Grace
The Duke of Portland
KG PC FRS
3rd Duke of Portland 1804.jpg
Prime Minister of the United Kingdom
In office
31 March 1807 – 4 October 1809
Monarch George III
Preceded by The Lord Grenville
Succeeded by Spencer Perceval
Prime Minister of Great Britain
In office
2 April 1783 – 19 December 1783
Monarch George III
Preceded by The Earl of Shelburne
Succeeded by William Pitt the Younger
Lord President of the Council
In office
30 July 1801 – 14 January 1805
Monarch George III
Prime Minister Henry Addington
William Pitt the Younger
Preceded by The Earl of Chatham
Succeeded by Viscount Sidmouth
Home Secretary
In office
11 July 1794 – 30 July 1801
Monarch George III
Prime Minister William Pitt the Younger
Preceded by Henry Dundas
Succeeded by Lord Pelham
Personal details
Born (1738-04-14)14 April 1738
Nottinghamshire
Died 30 October 1809(1809-10-30) (aged 71)
Bulstrode Park, Buckinghamshire
Political party Whig (Foxite) (1761–1794)
Tory (1794–1809)
Spouse(s) Lady Dorothy Cavendish (m. 1766; d. 1794)
Children 6
Alma mater Christ Church, Oxford
Signature Cursive signature in ink

William Henry Cavendish Cavendish-Bentinck, 3rd Duke of Portland, KG, PC, FRS (14 April 1738 – 30 October 1809) was a British Whig and Tory statesman, Chancellor of the University of Oxford, Prime Minister of Great Britain, serving in 1783 and Prime Minister of the United Kingdom from 1807 to 1809. The 24 years between his two terms as Prime Minister is the longest gap between terms of office of any Prime Minister. He was known before 1762 by the courtesy title Marquess of Titchfield. He held a title of every degree of British nobility—Duke, Marquess, Earl, Viscount, and Baron. He is also a great-great-great-grandfather of Queen Elizabeth II through her maternal grandmother.

Lord Titchfield was the eldest son of William Bentinck, 2nd Duke of Portland and Margaret Cavendish-Harley and inherited many lands from his mother and his maternal grandmother. He was educated at Westminster and Christ Church, Oxford.

On 8 November 1766, Portland married Lady Dorothy Cavendish, a daughter of William Cavendish, 4th Duke of Devonshire and Charlotte Boyle. They were parents of six children:


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