Julius Caesar remains, more than two thousand years after his death, one of the most recognisable figures in all of human history. His name became a title — Kaiser in German, Tsar in Russian — and his life a byword for ambition, brilliance, and the perils of absolute power. But who was the man behind the myth? And why does he matter so much to the history of Italy and the world?
This guide traces Caesar’s life from his origins in the back streets of Rome to the summit of Roman power, exploring his military genius, his political reforms, his complicated relationships, and the violent end that, paradoxically, gave birth to the empire his heir would build. For an overview of the empire that followed, see our guide to what was the Roman Empire?
Early life: a Roman of the old city
Gaius Julius Caesar was born on 12 July 100 BC, into a patrician family — the gens Julia — that claimed descent from Aeneas of Troy and, through him, from the goddess Venus herself. The claim was politically useful throughout his career, lending Caesar a sense of divine destiny that he was rarely shy about exploiting.
Despite their aristocratic lineage, Caesar’s family was not enormously wealthy, and they lived in the Subura, one of Rome’s more modest, densely populated inner-city districts, known for its noise, crime and street life. This upbringing among ordinary Romans may partly explain the populist instincts Caesar would display throughout his political life.
His father, also named Gaius Julius Caesar, died suddenly when the younger Caesar was around sixteen years old. This left him the effective head of the family at a precarious moment in Roman history. His aunt, Julia, was married to Gaius Marius, the reforming general who had revolutionised the Roman army and was locked in a bitter rivalry with the conservative aristocrat Lucius Cornelius Sulla. Caesar’s family connections to the Marian faction would nearly cost him his life.
When Sulla seized power in Rome in 82 BC and began his bloody proscriptions, Caesar — by then married to Cornelia, a daughter of a prominent Marian ally — was ordered to divorce his wife. He refused. Sulla confiscated his inheritance and priesthood, and Caesar was forced to flee Rome. Only the intercession of relatives and the Vestal Virgins persuaded Sulla to grant a pardon, though the dictator is said to have warned those pleading Caesar’s case that “in this Caesar there are many Mariuses.”
A young man in a hurry: early career and captivity
With Sulla’s death in 78 BC, Caesar returned to Rome and began the traditional path to political advancement, studying rhetoric in Rhodes and serving as a military tribune. He quickly established a reputation as a gifted orator — second in his day, some said, only to Cicero — and as a man of sharp intelligence and personal courage.
An early episode illustrated both qualities vividly. Travelling to Rhodes to continue his education, Caesar was captured by Cilician pirates, who demanded a ransom of 20 talents of silver. Caesar reportedly laughed and told them they were underestimating his worth and demanded they ask for 50. During the weeks his companions gathered the ransom, he socialised with his captors, joined in their games, and cheerfully told them he would return to crucify them once he was free. He was as good as his word: upon his release, he raised a small fleet, captured the pirates, and had them crucified. However, in a gesture apparently designed to show clemency, he had their throats cut first.
The political climb: alliances, debts and the First Triumvirate
The first triumvirate (l-r): Marcus Licinius Crassus, Julius Caesar, Gnaeus Pompey
Caesar’s rise in Roman politics was both rapid and carefully managed. He served as quaestor in Hispania, as aedile responsible for Rome’s public games and infrastructure, and as Pontifex Maximus, a prestigious religious office he won through aggressive campaigning in 63 BC. He was elected praetor in 62 BC and governor of Hispania Ulterior the following year, where his military campaigns against local tribes gave him his first significant military success and, crucially, enough wealth and prestige to pay down his ruinous debts.
Returning to Rome in 60 BC, Caesar forged the political alliance that would transform the republic. Together with the immensely wealthy Marcus Licinius Crassus and the celebrated general Gnaeus Pompey (known as Pompey the Great) he formed what historians call the First Triumvirate: an informal but powerful arrangement of mutual political support. The three men dominated Roman politics for years, sharing patronage, influence and military power.
Caesar’s reward for brokering the alliance was the consulship in 59 BC, which he used aggressively, pushing through popular legislation on land reform and debt relief despite fierce opposition from conservative senators. His co-consul, Bibulus, was so sidelined that Romans joked the year should be named not after its two consuls but after Caesar and Julius alone.
The Gallic Wars: conquest, massacre and literary propaganda
The extent of Caesar’s Gaul conquest is evident in this map of Roman Gallic rule. Image credit: worldhistory.org
Caesar’s consulship was followed by the pro-consulship that would make him the most celebrated military commander of his age: the governorship of Gaul. Over the course of eight years (58 BC to 50 BC), Caesar led Roman armies in a series of campaigns that brought the vast territory of what is now France, Belgium, Switzerland and parts of Germany under Roman control.
The Gallic Wars were extraordinary in their scope and brutality. Caesar fought dozens of major engagements, besieged fortified hilltop settlements, built extraordinary feats of military engineering and twice led expeditions across the Channel into Britain, the first Roman general to do so. His siege of Alesia in 52 BC, in which he simultaneously besieged an enemy force and held off a relieving army numbering in the hundreds of thousands, is still studied in military academies today.
The human cost was immense. Ancient sources suggest that around one million Gauls were killed and another million enslaved — numbers that modern historians regard as broadly plausible if not precise. The campaigns transformed Caesar from a politician with military ambitions into the most powerful man in the Roman world. They also made him extraordinarily rich, providing the funds to sustain his political ambitions back in Rome.
Literary propaganda
Caesar was not only a general but also a propagandist of genius. Throughout the campaigns he wrote his Commentarii de Bello Gallico — the Gallic Wars — seven books of vivid, third-person military narrative that served as a campaign memoir, political manifesto and work of literature. Written in the form of a dispatch, they present Caesar as a decisive, fair-minded commander forced by circumstance into necessary action. The Commentarii are still used to teach Latin in schools across Europe.
Further reading: The Gallic Wars are discussed in detail in the relevant volumes of the Loeb Classical Library.
Crossing the Rubicon: the point of no return
By 50 BC, Caesar’s enemies in Rome — led by Pompey, who had shifted from ally to rival — had passed a resolution ordering him to disband his army and return to Rome as a private citizen. To do so would have been to expose himself to prosecution and the destruction of everything he had built. Caesar refused.
On the night of 10 January 49 BC, he led a single legion (the Legio XIII Gemina) across the Rubicon, a small river that marked the southern boundary of his province and the legal limit of his military command. Crossing it with an army was an act of insurrection. Ancient sources record that Caesar paused at the bank before giving the order, invoking the phrase alea iacta est — the die is cast.
The phrase has entered every European language as a metaphor for an irrevocable decision. The crossing itself began a civil war that would last four years and reshape the Roman world permanently. Pompey fled Rome, then Greece, then Egypt, where he was murdered on the orders of the young Ptolemaic king before Caesar could reach him. Caesar wept, it is said, when shown his rival’s severed head.
Caesar and Cleopatra
Cleopatra Before Caesar by Jean-Léon Gérôme, oil on canvas, 1866.
In 48 BC, Caesar pursued the remnants of Pompey’s cause to Egypt. He arrived in Alexandria in the middle of a dynastic dispute between the young Ptolemy XIII and his older sister — and co-ruler — Cleopatra VII. Cleopatra, famously, had herself smuggled into Caesar’s quarters in a linen sack (or, in some accounts, rolled in a carpet) to request his support against her brother.
Caesar was captivated. The two became lovers, and Caesar provided the military support that secured Cleopatra’s grip on the Egyptian throne. She bore him a son, Caesarion — though Caesar never publicly acknowledged paternity — and later visited Rome with the child, causing considerable scandal. The relationship is one of the most celebrated in ancient history, though historians caution that our sources are overwhelmingly Roman, partial, and often hostile to Cleopatra.
Further reading: For scholarly context on Cleopatra’s world, the British Museum’s Egyptian collection provides important background.
Dictator perpetuo: Caesar’s reforms and growing power
By 46 BC Caesar had defeated his remaining enemies and returned to Rome in triumph. The Senate, now largely compliant, granted him a succession of powers that amounted, in practice, to one-man rule. In 44 BC the Senate appointed him dictator perpetuo (dictator in perpetuity), an office previously used as a temporary emergency measure. For his enemies, this was the clearest sign yet that Caesar intended to be not merely the most powerful man in the republic, but a monarch.
Yet Caesar’s use of that power was, by the standards of his time, relatively moderate. His reforms touched almost every aspect of Roman life. He reorganised the calendar — the Julian calendar, introduced in 46 BC, was based on a solar year of 365 days with a leap year every four years, and remained the basis of European timekeeping until the Gregorian reforms of 1582. He extended Roman citizenship to communities in Gaul and beyond, reducing the division between Romans and their subjects. And he launched ambitious building programmes in Rome and planned further projects — a canal through the Isthmus of Corinth, drainage of the Pontine Marshes, a new road across the Apennines — that never came to realisation.
He also reformed the Senate, expanding it to 900 members and introducing men from the provinces. His critics saw this as a dilution of Roman tradition; his supporters saw it as a long-overdue modernisation. Both were right, in different ways.
The conspiracy and the Ides of March
The assassination of Julius Caesar (1804-1805) by Vincenzo Camuccini
Despite, or perhaps because of, his effectiveness, Caesar had accumulated enemies. The conspiracy against him drew in around sixty senators, led by Gaius Cassius Longinus and Marcus Junius Brutus. Brutus was a figure of particular significance. A man of principle and Stoic philosophy, he fought against Caesar at Pharsalus before being pardoned and promoted by him. It was said Caesar regarded almost as a son.
The conspirators feared not only what Caesar had already done but what they believed he intended to do. Rumours circulated that he planned to declare himself king — a title that carried, in Roman tradition, a stigma going back to the expulsion of the last Tarquin kings five centuries earlier. When a priest called Spurinna warned Caesar to beware the Ides of March, Caesar reportedly dismissed the warning. His wife Calpurnia begged him not to attend the Senate on 15 March 44 BC, troubled by premonitions. He went nonetheless.
The story of what happened that morning at the Theatre of Pompey — how Caesar was surrounded, how the first blow was struck, how he fell — is told in our separate piece: The assassination of Julius Caesar. The conspirators stabbed him 23 times. He was 55 years old.
The aftermath: civil war and the birth of empire
The conspirators had planned the end of a tyrant. What they had not planned was what came next. Caesar’s funeral, at which Mark Antony gave a speech — immortalised, though not accurately reproduced, by Shakespeare — turned the Roman crowd against the assassins. Within days, Brutus and Cassius had fled Rome.
Caesar’s will revealed that he had adopted his great-nephew Octavian as his heir, and left money to every Roman citizen. Octavian, eighteen years old at the time of the assassination, proved to be, if anything, a colder and more calculating political operator than Caesar himself. After years of civil war, he defeated Mark Antony and Cleopatra at the Battle of Actium in 31 BC, and in 27 BC received from the Senate the title Augustus, becoming the first emperor of Rome.
The republic that the conspirators had died to preserve was gone. The empire that Caesar’s assassination had inadvertently created would endure, in various forms, for another five centuries in the west and nearly fifteen in the east.
Caesar’s legacy: the man behind the myth
Few figures in history have been interpreted and reinterpreted as continuously as Julius Caesar. In the Renaissance he was a model of the active, virtuous prince. To later republicans he was a warning against ambition. Napoleon saw him as a kindred spirit. To Shakespeare’s audiences he was a tragic study in the gap between human greatness and human frailty.
His literary legacy alone would ensure his place in history. The Gallic Wars and his account of the civil war (Bellum Civile) are among the finest surviving examples of Latin prose and, allowing for their obvious bias, remarkably readable. His calendar reform touched every human life in the Western world for over sixteen centuries.
His political legacy is more ambiguous. He is not, technically, the founder of the Roman Empire, that honour belongs to Augustus. But he made the empire possible, demonstrating that the republic’s institutions were no longer capable of managing an empire of Rome’s scale, and that the concentration of power in a single capable individual could produce, at least in the short term, more stability and more reform than the fractious, corrupt Senate. Whether that lesson was a good one for the long term is a question that historians and politicians have been debating ever since.
For further scholarly reading on Julius Caesar, the works of ancient biographer Plutarch (Life of Caesar) and historian Suetonius (The Twelve Caesars) remain primary sources, available in translation via the Loeb Classical Library. For modern scholarship, Adrian Goldsworthy’s Caesar: Life of a Colossus (Yale University Press) and Tom Holland’s Rubicon are considered among the most accessible and authoritative accounts.
Where to follow in Caesar’s footsteps in Italy today
The Largo di Argentina Rome before restoration. Editorial credit: LapaiIrKrapai / Shutterstock.com
Rome holds the most direct physical connections to Caesar’s life and death. The Largo di Torre Argentina — an archaeological site in the heart of the city, now open to the public — is the site where Caesar fell on the Ides of March 44 BC. The Roman Forum contains the Temple of Caesar, built on the spot where his body was cremated. Romans still leave flowers there on the anniversary of his death. The Capitoline Museums house portraits and busts from the period.
For the broader world of the Roman Republic and Empire that Caesar shaped, see our guide to what was the Roman Empire?
