The son of the second marquess (d. 1822); he was a gambler, bon vivant, art collector, and friend of the Prince Regent. He was Castlereagh's second in the 1809 duel with George Canning.

REFERENCES TO Francis Charles Seymour-Conway, third marquess of Hertford:

Lord Folkestone to Thomas Creevey, 21 September 1809 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Sydney Smith to Francis Jeffrey, [17] June 1812 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)

Henry Brougham to Thomas Creevey, [January?] 1813 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Henry Brougham to Thomas Creevey, 29 June 1814 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Lady Catherine Mackintosh to John Whishaw, 22 December 1814 in The “Pope” of Holland House: Selections from the Correspondence of John Whishaw and his Friends 1813-1840 (London: T. Fisher Unwin, 1906)

Henry Grey Bennet to Thomas Creevey, 3 April 1815 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Lady Morgan to Lady Olivia Clarke, 28 October 1819 in Lady Morgan’s Memoirs: Autobiography, Diaries and Correspondence. Second Edition, Revised 2 vols (London: Wm. H. Allen & Co., 1863)

William Augustus Conway to William Jerdan, 18 October 1822 in The Autobiography of William Jerdan. 4 vols (London: Arthur Hall, Vertue & Co., 1852-53)

Thomas Creevey to Elizabeth Ord, 3 December 1822 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Lady Morgan to Lady Olivia Clarke, 12 July 1824 in Lady Morgan’s Memoirs: Autobiography, Diaries and Correspondence. Second Edition, Revised 2 vols (London: Wm. H. Allen & Co., 1863)

Robert Plumer Ward to Peter George Patmore, 5 April 1827 in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Thomas Creevey to Elizabeth Ord, 25 November 1828 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

John Gibson Lockhart to Walter Scott Lockhart, 13 May 1844 in The Life and Letters of John Gibson Lockhart (London: John C. Nimmo, 1897)