The only son of Georgiana, duchess of Devonshire; he was Byron's contemporary at Harrow and Trinity College, Cambridge. “Hart,” as he was known, succeeded to the dukedom in 1811.

REFERENCES TO William George Spencer Cavendish, sixth duke of Devonshire:

Lord Byron to Elizabeth Bridget Pigot, 5 July 1807 in Letters and Journals of Lord Byron 2 Vols (London: John Murray, 1830)

Augusta Leigh to Francis Hodgson, 18 March 1815 in Memoir of Francis Hodgson 2 Vols (London: Macmillan and Co., 1878)

Lord Holland to Thomas Creevey, 4 July 1817 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Sydney Smith to Lady Holland, 11 October 1818 in A Memoir of the Reverend Sydney Smith. By his Daughter, Lady Holland. With a Selection from his Letters, edited by Mrs. Austin 2 vols (London: Longman, Brown, Green, and Longmans, 1855)

Frances Arkwright to Susanna Hodgson, [1820 c.?] in Memoir of Francis Hodgson 2 Vols (London: Macmillan and Co., 1878)

John Whishaw to Thomas Smith, 15 September 1820 in The “Pope” of Holland House: Selections from the Correspondence of John Whishaw and his Friends 1813-1840 (London: T. Fisher Unwin, 1906)

John Cam Hobhouse to John Murray, November 1820 in Memoir of John Murray 2 Vols (London: John Murray, 1891)

Sydney Smith to Lady Grey, 30 December 1820 in A Memoir of the Reverend Sydney Smith. By his Daughter, Lady Holland. With a Selection from his Letters, edited by Mrs. Austin 2 vols (London: Longman, Brown, Green, and Longmans, 1855)

Thomas Creevey to Elizabeth Ord, 29 January 1821 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Thomas Creevey to Elizabeth Ord, 6 February 1821 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Countess of Glengall to Frances Ann Taylor, 10 September 1821 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Duchess of Devonshire to Lady Morgan, 31 May 1823 in Lady Morgan’s Memoirs: Autobiography, Diaries and Correspondence. Second Edition, Revised 2 vols (London: Wm. H. Allen & Co., 1863)

Lady Caroline Lamb to William Godwin, [September? 1823] in William Godwin: his Friends and Contemporaries (London: Henry S. King & Co., 1876)

Lady Caroline Lamb to Lady Morgan, [June 1825?] in Lady Morgan’s Memoirs: Autobiography, Diaries and Correspondence. Second Edition, Revised 2 vols (London: Wm. H. Allen & Co., 1863)

Sydney Smith to Lady Holland, [October 1825] in A Memoir of the Reverend Sydney Smith. By his Daughter, Lady Holland. With a Selection from his Letters, edited by Mrs. Austin 2 vols (London: Longman, Brown, Green, and Longmans, 1855)

Lady Caroline Lamb to Lady Morgan, [November 1825?] in Lady Morgan’s Memoirs: Autobiography, Diaries and Correspondence. Second Edition, Revised 2 vols (London: Wm. H. Allen & Co., 1863)

Henry Brougham to Thomas Creevey, 27 April 1827 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Lady Caroline Lamb to Lady Morgan, [8 August 1827] in Lady Morgan’s Memoirs: Autobiography, Diaries and Correspondence. Second Edition, Revised 2 vols (London: Wm. H. Allen & Co., 1863)

Thomas Creevey to Elizabeth Ord, 20 September 1827 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Thomas Creevey to Elizabeth Ord, 13 February 1832 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Thomas Creevey to Elizabeth Ord, 23 December 1834 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Thomas Creevey to Elizabeth Ord, 28 March 1836 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

John Herman Merivale to Francis Hodgson, [13 May 1838] in Memoir of Francis Hodgson 2 Vols (London: Macmillan and Co., 1878)

Samuel Rogers to Sarah Rogers, January 1845 in Samuel Rogers and his Contemporaries 2 Vols (London: Smith, Elder & Co., 1889)