Rubicon
The Rubicon is a river that flows into the Adriatic Sea south of Ravenna, Italy. In the time of Julius Caesar, a river with this name was the border between the Roman province Gallia Cisalpina, and Italy, which was not a province at the time. The exact river Caesar referred to is unknown; the river that is known as Rubicone today was selected and named by Benito Mussolini.
Rubicon Media
Julius Caesar just before crossing the Rubicon
Detail of the Tabula Peutingeriana around the Rubicon