The Rubicon originally derived its importance from the fact that it was the boundary between all that part of the north of Italy which is formed by the valley of the Po, one of the richest and most magnificent countries of the world, and the more southern Roman territories. This country of the Po constituted what was in those days called the hither Gaul, and was a Roman province. It belonged now to Caesar's jurisdiction, as the commander in Gaul. All south of the Rubicon was territory reserved for the immediate jurisdiction of the city. The Romans, in order to protect themselves from any danger which might threaten their own liberties from the immense armies which they raised for the conquest of foreign nations, had imposed on every side very strict limitations and restrictions in respect to the approach of these armies to the capital. The Rubicon was the limit on this northern side. Generals commanding in Gaul were never to pass it. To cross the Rubicon with an army on the way to Rome was rebellion and treason. Hence the Rubicon became, as it were, the visible sign and symbol of civil restriction to military power.

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