1853-1917. British colonial administrator. In South Africa, early in 1896, he led the Jameson Raid from Mafeking into Transvaal to support the non-Boer colonists there, in an attempt to overthrow the government, for which he served some months in prison. Returning to South Africa, he succeeded Cecil Rhodes as leader of the Progressive Party of Cape Colony, where he was prime minister 1904-08.