Spencer Compton Cavendish, 8th Duke of Devonshire, (23 July 1833 β 24 March 1908), styled Lord Cavendish of Keighley between 1834 and 1858 and Marquess of Hartington between 1858 and 1891, was a British statesman.
He has the distinction of having served as leader of three political parties: as Leader of the Liberal Party in the House of Commons (1875β1880) and as of the Liberal Unionist Party (1886β1903) and of the Unionists in the House of Lords (1902β1903) (though the Conservatives and Liberal Unionists operated in close alliance from 1892β1903 and would eventually merge in 1912).
He also declined to become prime minister on three occasions, not because he was not a serious politician but because the circumstances were never right.