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The Rubicon (Latin: Rubic, Italian: Rubicone) is a 29-km-long river in northern Italy. Because the course of the river has frequently changed since then, it is impossible to confirm exactly where the Rubicon flowed when Caesar crossed it. When Julius Caesar crossed the Rubicon with his army in 49 BC, supposedly on January 10 of the Roman calendar, to make his way to Rome, he broke that law and made armed conflict inevitable. Location confusion After Caesar's crossing, the Rubicon was a geographical feature of note, but only for a few years, until Emperor Augustus abolished the Province of Gallia Cisalpina (todays northern Italy), and the river ceased to be the extreme border line of Italy. Attempts to deduce the original flow of the Rubicon can be done only by studying written documents and other archaeological evidence such as Roman milestones, which indicate the distance between the ancient river and the nearest Roman towns. In 1933, after various efforts spanning centuries, the river called Fiumicino, crossing the town of Savignano di Romagna (now Savignano sul Rubicone), was officially identified as the former Rubicon. It was a minor river even during Roman times (parvi Rubiconis ad undas as Lucan said, a rough translation being "to the waves of tiny Rubicon").