Portland, William Henry Cavendish-Bentinck, Duke of, 1738-1809

William Henry Cavendish Cavendish-Bentinck, 3rd Duke of Portland (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.