Lady Charlotte Elizabeth Boyle, was born 27 October 1731, the only surviving child and heir of Richard Boyle, Earl of Burlington and Cork and his wife, Lady Dorothy Savile. She was baptised 24 November 1731 at Chiswick, Middlesex. She succeeded her father as (6th) Baroness Clifford, 3 December 1753, his other titles either becoming extinct or passing to a cousin. Along with the title she inherited Bolton Abbey, estates in Yorkshire and Derbyshire, Chiswick and Burlington House in Piccadilly and property in county Cork and other places in Ireland.
She married 27 March 1748 at Lady Burlington's house in Pall Mall, St James's, Westminster, William Cavendish, Marquess of Hartington, later 4th Duke of Devonshire (born 1720, died 2 October 1764 at Spa in Germany). He didn't succeed to the Dukedom until 1755 which means Elizabeth was never Duchess of Devonshire but known by his courtesy title as Marchioness of Hartington.
They had the following four children:
William Cavendish, born 14 December 1748, succeeded his mother as Lord Clifford 1754, and his father as 5th Duke of Devonshire 1764
Lady Dorothy Cavendish, born 27 August 1750, died 3 June 1794, married 8 November 1766, William Henry Cavendish-Bentinck, 3rd Duke of Portland, and had issue;
Lord Richard Cavendish, born 19 June 1752, elected as a Member of Parliament for Lancaster 15 September 1773 and re-elected in 1774. In 1780 he was elected for Derbyshire but died 7 September 1781 at Naples (Napoli) where he had gone for his health;
Clifford Pedigree: Table Showing the Descent of the Barony of Clifford
Christie, I.R. (1964), 'Cavendish, Lord Richard (1752-81)' in The History of Parliament: the House of Commons 1754-1790, ed. L. Namier, J. Brooke; digitised at The History of Parliament: British political, social & local history website (http://www.historyofparliamentonline.org : viewed 13 April 2014).
Cokayne, G.E. & Gibbs, Vicary, (1912), The Complete Peerage: of England, Scotland, Ireland, Great Britian and the United Kingdom, extant, extinct or dormant, 2nd ed. vol. 2; London : St Catherine Press. Digitised by FamilySearch, from Library of Utah.
Cokayne, G.E., Gibbs, Hon. Vicary, Doubleday, H. Arthur, (1916), The Complete Peerage: of England, Scotland, Ireland, Great Britian and the United Kingdom, extant, extinct or dormant, 2nd ed. vol. 4; London : St Catherine Press. Digitised by FamilySearch
Cokayne, G.E., Doubleday, H.A., White, Geoffrey H., Lord Howard de Walden, (1945), The complete peerage: of a history of the House of Lords and all its members from the earliest times, 2nd ed. vol. 10; London : St Catherine Press. Digitised by FamilySearch