BiographyMargaret Cavendish Harley was born 11 February 1715 in Welbeck Abbey, Nottinghamshire, England, United Kingdom to Edward Harley, 2nd Earl of Oxford and Earl Mortimer (1689-1741) and Henrietta Cavendish Holles (1694-1755) and died 17 July 1785 in Bulstrode, Buckinghamshire, England, United Kingdom of unspecified causes. She married William Bentinck, 2nd Duke of Portland (1709-1762) 11 July 1734 at Oxford Chapel in Marylebone, Middlesex, England, United Kingdom. Notable ancestors include Henry II of England (1133-1189), William I of England (1027-1087), Charlemagne (747-814), Hugh Capet (c940-996), Rurik (c832-879), Alfred the Great (849-899). Ancestors are from the United Kingdom, France, England, Germany, Russia, Ukraine, Belgium, Spain, Portugal, Hungary, the Netherlands, Israel, Ireland, Belarus, Italy, Turkey, the Byzantine Empire.
|Offspring of William Bentinck, 2nd Duke of Portland and Margaret Cavendish Harley (1715-1785)|
|Elizabeth Cavendish-Bentinck (1735-1825)||27 July 1735||12 December 1825 Lower Grosvenor Street, London, Greater London, England, United Kingdom|| Thomas Thynne, 1st Marquess of Bath (1734-1796)|
|Henrietta Cavendish-Bentinck (1737-1827)||8 February 1737||4 June 1827|| George Harry Grey, 5th Earl of Stamford (1737-1819)|
|William Henry Bentinck, 3rd Duke of Portland (1738-1809)||14 April 1738 Welbeck Abbey, Nottinghamshire, England, United Kingdom||30 October 1809 Bulstrode Park, Buckinghamshire, England, United Kingdom|| Dorothy Cavendish (1750-1794)|
|Margaret Bentinck (1739-1756)|| |
|Frances Bentinck (1741-1743)|| |
|Edward Charles Bentinck (1744-1819)|