page_title: William Cavendish-Bentinck, 3rd Duke of Portland
section_title: Marriage and children
hierarchical_section_title: William Cavendish-Bentinck, 3rd Duke of Portland / Biography / Marriage and children
caption_attribution_description: English: Dorothy Cavendish was daughter of William Cavendish, 4th Duke of Devonshire and wife of William Cavendish-Bentinck, 3rd Duke of Portland (1738-1809)
context_page_description: William Henry Cavendish Cavendish-Bentinck, 3rd Duke of Portland, KG, PC, FRS was a British Whig and Tory politician during the late Georgian era. He served as Chancellor of the University of Oxford and twice as the Prime Minister, of Great Britain and then of the United Kingdom. The twenty-four years between his two terms as Prime Minister is the longest gap between terms of office of any British Prime Minister.
  Portland 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 Elizabeth II through her maternal grandmother.
context_section_description: On 8 November 1766, Portland married Lady Dorothy Cavendish, a daughter of William Cavendish, 4th Duke of Devonshire and Charlotte Boyle. They were parents of six children:
  William Bentinck, 4th Duke of Portland (24 June 1768 – 27 March 1854).
  Lord William Henry Cavendish-Bentinck (14 September 1774 – 17 June 1839).
  Lady Charlotte Cavendish-Bentinck (3 October 1775 – 28 July 1862). Married Charles Greville, and they had three sons: Charles Cavendish Fulke Greville, Algernon Greville, and Henry William Greville (1801–1872), and a daughter, Harriet (1803–1870) m. Francis Egerton, 1st Earl of Ellesmere.
  Lady Mary Cavendish-Bentinck (13 March 1779 – 6 November 1843).
  Lord Charles Bentinck (3 October 1780 – 28 April 1826). Paternal grandfather of Cecilia Bowes-Lyon, Countess of Strathmore and Kinghorne, grandmother to Queen Elizabeth II; ancestor of the 6th and 7th dukes of Portland, and of Lady Ottoline Morrell.
  Lord Frederick Cavendish-Bentinck (2 November 1781 – 11 February 1828) married Lady Mary Lowther (died 1863), daughter of William Lowther, 1st Earl of Lonsdale, 16 September 1820; had issue: George Cavendish-Bentinck, ancestor of the 8th and 9th dukes of Portland.
  A stillborn baby, birthed at Burlington House on 20 October 1786.
  Through his son Charles, Portland is a great-great-great-grandfather of Queen Elizabeth II (see ancestry of Elizabeth II).
caption: Lady Dorothy Cavendish, wife of William Cavendish Bentinck. (George Romney)
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