Sir Ronald Syme, OM, FBA (11 March 1903 – 4 September 1989) was a New Zealand-born historian and classicist. He was regarded as the greatest historian of ancient Rome since Theodor Mommsen and the most brilliant exponent of the history of the Roman Empire since Edward Gibbon. His great work was The Roman Revolution (1939), a masterly and controversial analysis of Roman political life in the period following the assassination of Julius Caesar.