River
Fluvius Rubicum
Pisciatello (?) · Urgone (TIR)
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In 49 BC Caesar led his army across the Rubicon, the small river that marked the border between Italy and his province of Cisalpine Gaul, and so set off a civil war. The Roman writer Pliny called it once the boundary of Italy. Ancient authors traced the name to the reddish gravel of its bed. The map lets it run from a mountain into the Adriatic and marks a road station where a road crosses it, perhaps at a bridge. Which stream it really was remains unclear. It was probably the Pisciatello, whose tributary, the Urgone, may still preserve the old name.