Sir Ronald Syme, OM, FBA (11 March 1903 – 4 September 1989) was a New Zealand-born historian and classicist. Long associated with Oxford University, he is widely regarded as the 20th century's greatest historian of ancient Rome. 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.

http://en.wikipedia.org/wiki/Ronald_Syme