Career
Rachel Russell. They had seven children:
Lady Caroline Cavendish (22 May 1719 – 20 January 1760), married William Ponsonby, 2nd Earl of Bessborough and had issue. William Cavendish, 4th Duke of Devonshire (1720 – 2 October 1764)
Lord George Augustus Cavendish (d 2 May 1794), died unmarried. Lady Elizabeth Cavendish (bef 1727–1796), married Honorary
John Ponsonby and had issue.
Field Marshal Lord Frederick Cavendish (c 1729 – 21 October 1803), died unmarried. Lord John Cavendish (c 1734–1796)
Lady Rachel Cavendish (7 June 1727 - 8 May 1805), married Horatio Walpole, 1st Earl of Orford.
Like his father, the 3rd Duke was active in politics, and served for seven years as Lord Lieutenant of Ireland. He was made a Privy Counsellor (Personal Computer) in 1731, and served as Lord Privy Seal from 1731 to 1733.
He was invested as a Knight of the Garter (Knight of the Order of the Garter) in 1733.
In 1739, he was enlisted as a founding governor for the new children"s charity, the Foundling Hospital, in Bloomsbury, London, which aimed to alleviate the problem of babies being abandoned by destitute mothers and ended up becoming a centre for British art and music William Cavendish sold the Old Devonshire House at 48 Boswell Street, Theobald"s Road in Bloomsbury. In 1734 Cavendish engaged architect William Kent to build a new Cavendish House in fashionable Picadilly.
During the Jacobite rising of 1745 the Duke raised a militia in support of the King, known as the Derbyshire Blues, which mustered at The George Inn, Derby, on 3 December 1745.
Charles and Diana were seventh cousins once removed as Charles descends from William"s son, the 4th Duke, and Diana was descended from William"s daughter, Lady Elizabeth.