The phrase "crossing the Rubicon" is an idiom that means "passing a point of no return". Its meaning comes from allusion to the crossing of the river Rubicon from the north by Julius Caesar in early January 49 BC. The exact date is unknown. Scholars usually place it on the night of 10 and 11 January because of the speeds at which messengers could travel at that time. It is often asserted that Caesar's crossing of the river precipitated Caesar's civil war, but Caesar's forces had already crossed into Italy and occupied Ariminum the previous day.

Caesar's civil war (49–45 BC) was a civil war during the late Roman Republic between two factions led by Gaius Julius Caesar and Gnaeus Pompeius Magnus (Pompey). The main cause of the war was political tensions relating to Caesar's place in the republic on his expected return to Rome on the expiration of his governorship in Gaul.

Before the war, Caesar had led an invasion of Gaul for almost ten years. A build-up of tensions starting in late 50 BC, with both Caesar and Pompey refusing to back down, led to the outbreak of civil war. Pompey and his allies induced the Senate to demand Caesar give up his provinces and armies in the opening days of 49 BC. Caesar refused and instead marched on Rome.

The war was fought in Italy, Illyria, Greece, Egypt, Africa, and Hispania. The decisive events occurred in Greece in 48 BC: Pompey defeated Caesar at the Battle of Dyrrhachium, but the subsequent larger Battle of Pharsalus was won by Caesar and Pompey's army disintegrated. Many prominent supporters of Pompey (termed Pompeians) surrendered after the battle, such as Marcus Junius Brutus and Cicero. Others fought on, including Cato the Younger and Metellus Scipio. Pompey fled to Egypt, where he was assassinated upon arrival.

Caesar led a military expedition to Asia Minor before attacking North Africa, where he defeated Metellus Scipio in 46 BC at the Battle of Thapsus. Cato and Metellus Scipio killed themselves shortly thereafter. The following year, Caesar defeated the last of the Pompeians, at the Battle of Munda in Spain, who were led by his former lieutenant Labienus. Caesar was then made dictator perpetuo ("dictator in perpetuity" or "dictator for life") by the Roman senate in 44 BC. He was assassinated by a group of senators (including Brutus) shortly thereafter.

The civil war is one of the commonly recognised endpoints of Rome's republican government. Some scholars view the war as the proximate cause of the republic's fall, due to its polarising interruption of normal republican government.[4] Caesar's comprehensive victory followed by his immediate death left a power vacuum; over the following years his heir Octavian was eventually able to take complete control, forming the Roman Empire as Augustus.

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