William Cavendish-Bentinck, 3rd Duke of Portland

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 twice as the Prime Minister of Great Britain (1783) and then of the United Kingdom (1807–1809). The 24 years between his two terms as Prime Minister is the longest gap between terms of office of any British Prime Minister.