3rd Duke of Portland

His Grace The Duke of Portland KG PC FRS
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
Parents	William Bentinck, 2nd Duke of Portland Margaret Cavendish-Harley
Alma mater	Christ Church, Oxford
Signature

William Henry Cavendish Cavendish-Bentinck, 3rd Duke of Portland, KG, PC, FRS (14 April 1738 – 30 October 1809), was a British Whig and Tory politician of the late Georgian era. He served as Chancellor of the University of Oxford,Prime Minister of Great Britain (1783) and Prime Minister of the United Kingdom (1807–09). The 24 years between his two terms as Prime Minister is the longest gap between terms of office of any British 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:

...
Wikipedia