The Duke of Portland | |
|---|---|
 | |
| 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 – 18 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 | |
| Prime Minister | Henry Addington William Pitt the Younger |
| Preceded by | The Earl of Chatham |
| Succeeded by | The Viscount Sidmouth |
| Home Secretary | |
| In office 11 July 1794 – 30 July 1801 | |
| Prime Minister | William Pitt the Younger |
| Preceded by | Henry Dundas |
| Succeeded by | Lord Pelham |
| Leader of the House of Lords | |
| In office 2 April 1783 – 18 December 1783 | |
| Prime Minister | Himself |
| Preceded by | The Earl of Shelburne |
| Succeeded by | The Earl Temple |
| Lord Lieutenant of Ireland | |
| In office 8 April 1782 – 15 August 1782 | |
| Prime Minister | The Earl of Shelburne |
| Preceded by | The Earl of Carlisle |
| Succeeded by | The Earl Temple |
| Lord Chamberlain of the Household | |
| In office 1765–1766 | |
| Monarch | George III |
| Preceded by | The Earl Gower |
| Succeeded by | The Earl of Hertford |
| Personal details | |
| Born | 14 April 1738 Bulstrode Park, Gerrards Cross, Buckinghamshire, England |
| Died | 30 October 1809 (aged 71) Westminster, England |
| Resting place | St Marylebone Parish Church |
| Political party | |
| Spouse | |
| Children | 6, including |
| Parents | |
| 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 then a Tory politician during the late Georgian era. He served as chancellor of the University of Oxford (1792–1809) and as Prime Minister of Great Britain (1783) and then of the United Kingdom (1807–1809). The gap of 26 years between his two terms as prime minister is the longest of any British prime minister. He was also an ancestor of King Charles III through his great-granddaughter Cecilia Bowes-Lyon, Countess of Strathmore and Kinghorne.
Portland was known before 1762 by the courtesy title Marquess of Titchfield. He held a title for every degree of British nobility: duke, marquess, earl (Earl of Portland), viscount (Viscount Woodstock), and baron (Baron Cirencester). He was the leader of the Portland Whigs faction, which broke with the Whig leadership of Charles James Fox and joined with William Pitt the Younger in the wake of the French Revolution.