Rubicon (ancient world)

Rubico (Fiumicino), River

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A small stream in eastern Italy (Romagna)—a little to the north of Ariminum (Rimini)—forming the boundary, in Roman Republican times, between Italy and Cisalpine Gaul. The civil war between Julius Caesar and Pompey the Great was launched by Caesar in 49 BC when he and his army crossed the Rubicon, since this departure outside Cisalpine Gaul (which formed part of the appointed territory of his governorship), in order to effect an unauthorized entry into the homeland with an armed force, was an unconstitutional and illegal act. After horses had been set free as a religious offering—so as to dispel fears of sacrilege—Caesar sent the only legion he had at his disposal across the stream, and, after himself crossing over with his staff, divided this force into two columns that rapidly moved southward, thus inducing his enemies to evacuate Rome (and subsequently Italy).