Rubicon
A small river in Italy. By crossing it, and thus transgressing the boundaries of his province, Caesar declared war against the senate and Pompey. "Passing the Rubicon" has become a proverbial expression, indicating an irrevocable step taken in any weighty matter.
Rudiae (Rotigliano or Ruge). A town of the Peucetii in Apulia. Rudiae is celebrated as the birthplace of Ennius.
Rullus, P. Servilius. A tribune of the plebs в. c. 63, who proposed an agrarian law, which Cicero attacked in three orations, which have come down to us.