The Rubicon ( la, Rubico; it, Rubicone ; rgn, Rubicôn ) is a shallow
river in northeastern
Italy, just north of
Rimini.
It was known as Fiumicino until 1933, when it was identified with the ancient river Rubicon,
famously crossed by
Julius Caesar
Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
in 49 BC.
The river flows for around from the
Apennine Mountains
The Apennines or Apennine Mountains (; grc-gre, links=no, Ἀπέννινα ὄρη or Ἀπέννινον ὄρος; la, Appenninus or – a singular with plural meaning;''Apenninus'' (Greek or ) has the form of an adjective, which wou ...
to the
Adriatic Sea through the south of the
Emilia-Romagna region, between the towns of
Rimini and
Cesena.
History
The Latin word comes from the adjective , meaning "red". The river was so named because its waters are colored red by iron deposits in the riverbed.
During the
Roman Republic, the Rubicon marked the boundary between the
Roman province of
Cisalpine Gaul
Cisalpine Gaul ( la, Gallia Cisalpina, also called ''Gallia Citerior'' or ''Gallia Togata'') was the part of Italy inhabited by Celts (Gauls) during the 4th and 3rd centuries BC.
After its conquest by the Roman Republic in the 200s BC it was con ...
and
Italy proper, controlled directly by Rome and its (allies), to the south. On the north-western side, the border was marked by the river
Arno, a much wider and more important waterway, which flows westward from the Apennine Mountains (the Arno and the Rubicon rise not far from each other) into the
Tyrrhenian Sea.

In 49 BC, perhaps on January 10,
Julius Caesar
Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
led a single
legion,
Legio XIII Gemina, south over the Rubicon from Cisalpine Gaul to Italy to make his way to Rome. In doing so, he deliberately broke the law limiting his , making armed conflict inevitable.
Suetonius
Gaius Suetonius Tranquillus (), commonly referred to as Suetonius ( ; c. AD 69 – after AD 122), was a Roman historian who wrote during the early Imperial era of the Roman Empire.
His most important surviving work is a set of biographies ...
depicts Caesar as undecided as he approached the river, and attributes the crossing to a supernatural apparition. It was reported that Caesar dined with
Sallust,
Hirtius,
Gaius Oppius
Gaius Oppius was an intimate friend of Julius Caesar. He managed the dictator's private affairs during his absence from Rome, and, together with Lucius Cornelius Balbus, exercised considerable influence in the city.
According to Suetonius (''Cae ...
,
Lucius Cornelius Balbus, and
Servius Sulpicius Rufus on the night after his crossing.
According to Suetonius, Caesar uttered the famous phrase ('the
die
Die, as a verb, refers to death, the cessation of life.
Die may also refer to:
Games
* Die, singular of dice, small throwable objects used for producing random numbers
Manufacturing
* Die (integrated circuit), a rectangular piece of a semicondu ...
is cast') upon crossing the Rubicon, signifying that his action was irreversible. The phrase "crossing the Rubicon" is now used to refer to committing irrevocably to a grave course of action, similar to the modern phrase "passing the
point of no return". The presence of Caesar and his legion in Italy forced
Pompey, the
consuls, and a large part of the senate to flee Rome. Caesar's victory in the
subsequent civil war ensured that he would never be punished for his actions.

After Caesar's crossing, the Rubicon was a geographical feature of note until about 42 BC, when
Octavian merged the Province of
Cisalpine Gaul
Cisalpine Gaul ( la, Gallia Cisalpina, also called ''Gallia Citerior'' or ''Gallia Togata'') was the part of Italy inhabited by Celts (Gauls) during the 4th and 3rd centuries BC.
After its conquest by the Roman Republic in the 200s BC it was con ...
into
Italia and the river ceased to be the extreme northern border of Italy. The decision robbed the Rubicon of its importance, and the name gradually disappeared from the local toponymy.
After the
fall of the Western Roman Empire, and during the first centuries of the
Middle Ages, the coastal plain between
Ravenna and
Rimini was flooded many times. The Rubicon, like other small rivers of the region, often changed its course during this period. For this reason, and to supply fields with water after the revival of agriculture in the
late Middle Ages, during the 14th and 15th centuries, hydraulic works were built to prevent other floods and to regulate streams. As a result of this work, these rivers started to flow in straight courses, as they do today.
Identification
With the revival during the fifteenth century of interest in the topography of ancient Roman Italy, the matter of identifying the Rubicon in the contemporary landscape became a topic of debate among
Renaissance humanists. To support the claim of the Pisciatello, a spurious inscription forbidding the passage of an army in the name of the Roman people and Senate, the so-called ''Sanctio'', was placed by a bridge on that river. The
Quattrocento humanist
Flavio Biondo was deceived by it; the actual inscription is conserved in the Museo Archeologico, Cesena. As the centuries went by, several rivers of the Adriatic coast between Ravenna and Rimini have at times been said to correspond to the ancient Rubicon.
The ''
Via Aemilia'' (modern SS 9) still follows its original Roman course as it runs between the hills and the plain; it would have been the obvious course to follow as it was the only major Roman road east of the
Apennine Mountains
The Apennines or Apennine Mountains (; grc-gre, links=no, Ἀπέννινα ὄρη or Ἀπέννινον ὄρος; la, Appenninus or – a singular with plural meaning;''Apenninus'' (Greek or ) has the form of an adjective, which wou ...
leading to and from the
Po Valley
The Po Valley, Po Plain, Plain of the Po, or Padan Plain ( it, Pianura Padana , or ''Val Padana'') is a major geographical feature of Northern Italy. It extends approximately in an east-west direction, with an area of including its Venetic ex ...
. Attempts to deduce the original course of the Rubicon can be made 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.
The
mile zero of a
Roman road
Roman roads ( la, viae Romanae ; singular: ; meaning "Roman way") were physical infrastructure vital to the maintenance and development of the Roman state, and were built from about 300 BC through the expansion and consolidation of the Roman Re ...
, from which distances were counted, was always the crossing between the
Cardo and the
Decumanus
In Roman urban planning, a decumanus was an east–west-oriented road in a Roman city or castrum (military camp). The main decumanus of a particular city was the Decumanus Maximus, or most often simply "the Decumanus". In the rectangular street gr ...
, the two principal streets in every Roman town, running north–south and east–west respectively. In a section of the
Tabula Peutingeriana, an ancient document showing the network of Roman roads, a river in northeastern Italy labeled "''fl. Rubicu''" is shown at a position 12
Roman miles () north of Rimini along the coastline; this is the distance between Rimini and a place called "Ad Confluentes," drawn west of the Rubicon, on the Via Aemilia. However, the river-bed shape observed in Pisciatello and the Rubicon river in the present day, well below Roman-age soil layers, is likely to indicate that any possible course modification of rivers could have occurred only very close to the coastline, and therefore only slight.
Furthermore, the features of the present-day Rubicon river (north–south course, orthogonal to the Via Aemilia) and the Via Aemilia itself (a straight reach before and after the crossing, and a turn just passing by , so marking a possible administrative boundary) are common to typical geographical oriented limits of Roman age, being what made this a clue of actual identification of the present-day Rubicon River with the Fiumicino.
In 1933, after various efforts that spanned centuries, the Fiumicino, which crossed the town of Savignano di Romagna (now
Savignano sul Rubicone), was officially identified as the former Rubicon. Strong evidence supporting this theory came in 1991,
[Pignotti R., Ravagli P., Donati G., "Rubico quondam finis Italiae", ''Città del Rubicone'', p. 3, October, 1991] when three Italian scholars (Pignotti, Ravagli, and Donati), after a comparison between the
Tabula Peutingeriana and other ancient sources (including
Cicero), showed that the distance from Rome to the Rubicon River was 200 Roman miles. Key elements of their work are:
* The locality of San Giovanni in Compito (now a western quarter of Savignano) has to be identified with the old ''Ad Confluentes'' (''compitum'' means "road junction", and is synonymous with ''confluentes'').
* The distance between ''Ad Confluentes'' and Rome, according to the
Tabula Peutingeriana, is 201 Roman miles.
* The distance from today's San Giovanni in Compito and the Fiumicino river is one Roman mile ().
Present

Today there is no visible, material evidence of Caesar's historical passage.
Savignano sul Rubicone is an industrial town and the river has become one of the most polluted in the
Emilia-Romagna region. Exploitation of underground waters along the upper course of the Rubicon has reduced its flow—it was a minor river even during Roman times ("''parvi Rubiconis ad undas''" as
Lucan
Marcus Annaeus Lucanus (3 November 39 AD – 30 April 65 AD), better known in English as Lucan (), was a Roman poet, born in Corduba (modern-day Córdoba), in Hispania Baetica. He is regarded as one of the outstanding figures of the Imperial ...
said, "to the waves of
hetiny Rubicon")—and has since lost its natural route, except in its upper course, between low and woody hills.
References
External links
*
*
Livius.org: RubicoRubicon in dictionary*
{{Authority control
Rivers of Italy
Roman Italy
Julius Caesar
Rivers of Emilia-Romagna
Adriatic Italian coast basins