William Cavendish, 7th Baron Cavendish, 4th Marquess of Hartington, 4th Duke of Devonshire, was born 8 May 1720 in Hardwick Hall, Derbyshire, England, United Kingdom to William Cavendish, 3rd Duke of Devonshire (1698-1755) and Catherine Hoskins (c1700-1777) and died 2 October 1764 Spa, Liège, Belgium of unspecified causes. He married Charlotte Elizabeth Boyle, 6th Baroness Clifford (1731-1754) 27 March 1748 in St James, Westminster, Greater London, England, United Kingdom.
|Offspring of William Cavendish, 4th Duke of Devonshire and Charlotte Elizabeth Boyle, 6th Baroness Clifford (1731-1754)|
|William Cavendish, 5th Duke of Devonshire (1748-1811)||14 December 1748||29 July 1811 Piccadilly, London, England, United Kingdom||Georgiana Spencer (1757-1806) Georgiana Spencer (1757-1806) Elizabeth Christiana Hervey (1757-1824)|
|Dorothy Cavendish (1750-1794)||27 August 1750||3 June 1794 Burlington House, Piccadilly, Greater London, England, United Kingdom||William Henry Bentinck, 3rd Duke of Portland (1738-1809)|
|Richard Cavendish (1751-1781)||19 June 1751 Hardwick, Derbyshire, England, United Kingdom||12 September 1781 Naples, Campania, Italy|
|George Augustus Henry Cavendish, 1st Earl of Burlington (1754-1834)||21 March 1754||4 May 1834 Burlington House, London, Greater London, England, United Kingdom||Elizabeth Compton (1760-1835)|