Crossing the Rubicon

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The phrase "crossing the Rubicon" is an

The civil war ultimately led to Caesar's becoming dictator for life (dictator perpetuo). Caesar had been appointed to a governorship over a region that ranged from southern Gaul to Illyricum. As his term of governorship ended, the Senate ordered him to disband his army and return to Rome. As it was illegal to bring armies into Italy (the northern border of which was marked by the river Rubicon) his crossing the river under arms amounted to insurrection, treason, and a declaration of war on the state. According to some authors, he uttered the phrase alea iacta est ("the die is cast") before crossing.

History

During the late Roman Republic, the river Rubicon marked the boundary between the Roman province of Cisalpine Gaul to the northeast and Italy proper (controlled directly by Rome and its allies) to the south. On the northwestern side, the border was marked by the river Arno, a much wider and more important waterway, which flows westward from the Apennine Mountains (its source is not far from the Rubicon's source) into the Tyrrhenian Sea.

Governors of Roman provinces were appointed promagistrates with imperium (roughly, "right to command") in one or more provinces. The governors then served as generals of the Roman army within the territory they ruled. Roman law specified that only the elected magistrates (consuls and praetors) could hold imperium within Italy. Any magistrate who entered Italy at the head of his troops forfeited his imperium and was therefore no longer legally allowed to command troops.

Exercising imperium when forbidden by the law was a capital offense. Furthermore, obeying the commands of a general who did not legally possess imperium was a capital offense. If a general entered Italy in command of an army, both the general and his soldiers became outlaws and were automatically condemned to death. Generals were thus obliged to disband their armies before entering Italy.

Julius Caesar

In January 49 BC,

According to Suetonius, Caesar uttered the famous phrase ālea iacta est ("the die has been cast").^[8] The phrase "crossing the Rubicon" has survived to refer to any individual or group committing itself to a risky or revolutionary course of action, similar to the modern phrase "passing the point of no return". Caesar's decision for swift action forced Pompey, the consuls, and a large part of the Roman Senate to flee Rome.

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