William Cavendish-Bentinck, 3rd Duke of Portland

William Henry Cavendish Cavendish-Bentinck, 3rd Duke of Portland, 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 the fourth great-grandfather of King Charles III through his great-granddaughter Cecilia Bowes-Lyon, Countess of Strathmore and Kinghorne.

14 April 1738

Born on the same birth day (14 April): Anthony Michael Hall • Averroes • Dany Robin • Erich von Däniken • Lothaire Bluteau • Ralph Willis • Rebecca DiPietro • Robert Doisneau • Roger Frappier