William Cavendish-Bentinck, 3rd Duke of Portland

William Henry Cavendish Cavendish-Bentinck, 3rd Duke of Portland, KG, PC, FRS 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.

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http://www.thepeerage.com/p225.htm#i2241

http://www.victorianweb.org/history/pms/portland.html

http://www.historyhome.co.uk/pms/portland.htm

http://www.geneall.net/U/per_page.php?id=17855