Charles Cavendish Fulke Greville was an English diarist and an amateur cricketer who played first-class cricket from 1819 to 1827. His father, Charles Greville, was a second cousin of the 1st Earl of Warwick. His mother, Lady Charlotte Bentinck, was a daughter of the 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.