Short answer
- Julius Caesar was a Roman general, politician, and writer who lived from about 100 BCE to 44 BCE and who helped bring the Roman Republic to an end. His full name was Gaius Julius Caesar. He is best known for conquering Gaul, a large region that covered much of modern France and Belgium and parts of neighboring countries, for winning a civil war against his former ally Pompey, and for ruling Rome as dictator until he was assassinated on March 15, 44 BCE, a date the Romans called the Ides of March. Caesar was not an emperor, even though his name later became a word for emperor. He held the Roman office of dictator, first for limited periods and then, in early 44 BCE, as dictator for life, a title given in Latin as dictator perpetuo. After his death, further civil wars followed, and his adopted heir Octavian eventually became Augustus, the first emperor. To understand Caesar, separate three things that are often mixed together: what Caesar did, what Caesar said about himself, and what later writers said about him.
By Emma Hudson
A Roman, not an emperor
The most common mistake about Caesar is to call him the first emperor of Rome. That title belongs to Augustus, not to Caesar. Rome in Caesar’s lifetime was still a republic, a state in which power was supposed to be shared among elected magistrates, the Senate, and popular assemblies, even though that system was under severe strain. Caesar rose inside that system, broke its rules in decisive ways, and concentrated power in his own hands, but he did not formally replace the republic with an empire. The empire came later, after his death, when Octavian defeated his rivals and built a new arrangement that kept republican forms while placing real power with one ruler.
His assassins did not kill a crowned king. They killed a dictator whose accumulation of offices, honors, and lifetime tenure looked, to them, like monarchy in all but name. Modern scholars still debate how far Caesar intended to become a king in the formal sense, and whether his reforms were mainly practical repairs or steps toward permanent one man rule. The surviving evidence does not settle that debate, so this article does not settle it either. Encyclopaedia Britannica describes him as a celebrated Roman general and statesman, conqueror of Gaul, victor in the civil war of 49 to 45 BCE, and dictator from 46 to 44 BCE. The family name Caesar later became a title for Roman rulers, and from it came the German word Kaiser and the Russian word tsar.
Family and youth
Caesar was born into the Julii, a patrician family, meaning a family of Rome’s old aristocracy. Britannica stresses a qualification: the Julii were old and respected, but by Caesar’s time they were not rich, powerful, or especially distinguished. He had a famous name and useful connections, but not the wealth a Roman political career demanded, and he spent much of his life borrowing, spending, and seeking commands that could restore his finances.
The family’s claimed ancestry should be read as a claim, not as a documented fact. The Julii traced their line to Venus, the goddess of love, through her son Aeneas, the legendary Trojan hero. Suetonius, writing about a century and a half after Caesar’s death, records Caesar himself making that claim in a funeral speech for his aunt Julia. Treat that speech as evidence of how Caesar wanted to be seen, not as proof of divine descent.
Caesar’s birth date is also less certain than many short biographies suggest. Britannica gives his birth as July 12 or 13, 100 BCE, with a question mark after the year, and explains that the date has long been disputed. If the traditional year is correct, Caesar must have held each of his offices two years before the legal minimum age, which is one reason some scholars argue for a slightly different year. This article therefore says about 100 BCE, and gives the day as July 12 or 13. His father, also named Gaius Julius Caesar, died when Caesar was about 16, and his mother Aurelia is described by Britannica as a notable woman to whom he owed much.
As a young man, Caesar aligned himself with the popular cause associated with his uncle by marriage, the general Gaius Marius, rather than with the conservative Senate leadership. In 84 BCE he married Cornelia, daughter of Lucius Cornelius Cinna, a leading associate of Marius. When the conservative dictator Lucius Cornelius Sulla returned to power, Sulla ordered Caesar to divorce Cornelia. Caesar refused, and Suetonius reports that he lost his priesthood, his wife’s dowry, and family inheritances, and had to go into hiding until influential relatives and the Vestal Virgins secured his pardon. Two other youth stories, the pirate capture on his way to Rhodes and his sigh before a statue of Alexander the Great in Spain, come from the same later tradition: useful for how Caesar was remembered, not as transcripts of private moments.
Climbing the ladder of Roman offices
Roman politics rewarded men who won a sequence of elected offices, and Caesar climbed that ladder with conspicuous spending and risk. He served as quaestor, a financial and administrative office, in about 69 or 68 BCE, in Farther Spain, covering much of modern Andalusia and Portugal. He was elected aedile for 65 BCE, an office concerned with public buildings, festivals, and games, and marked his year with unusually lavish expenditure, largely with borrowed money, according to Britannica. In 63 BCE he was elected pontifex maximus, the chief priest of Rome, by what Britannica calls a political maneuver. In the same year, after the suppression of the conspiracy of Catiline, he proposed a more merciful penalty for the arrested conspirators than the death penalty Cicero was seeking. His motion was defeated, but it shows him willing to take a public position against the dominant mood.
He was elected praetor for 62 BCE, then obtained the governorship of Farther Spain for 61 to 60 BCE. A military expedition beyond the northwestern frontier brought loot for himself, his soldiers, and the treasury, and that recovery allowed him, on his return to Rome in 60 BCE, to stand for the consulship, the highest regular elected office, for 59 BCE. The pattern repeats throughout his career: political spending created debt, military command offered a way to repay it, and success in war created the reputation and loyal army that made the next step possible.
The First Triumvirate: an alliance, not an office
In 60 BCE, Caesar, Pompey, and Marcus Licinius Crassus formed the alliance now known as the First Triumvirate. The name can mislead, because it was not a formal office created by law. It was an informal political alliance among three powerful men who agreed to support one another and dominate Roman politics together. They combined separate resources: Pompey’s military reputation and veteran soldiers, Crassus’s wealth, and Caesar’s political skill and popular support.
With their backing, Caesar won the consulship for 59 BCE and then secured a major military command in Gaul. That command gave him the army, money, and reputation that would eventually allow him to challenge Pompey himself. The alliance broke down after Crassus was killed in the East in 53 BCE, and after the death of Julia, Caesar’s daughter and Pompey’s wife, removed a personal link between the two remaining partners. By 50 BCE, Pompey had realigned himself with the Senate, and the Senate ordered Caesar to give up his command and return to Rome as a private citizen. Returning without a command would have left Caesar exposed to prosecution and stripped of the army that protected his position. The sequence is not in doubt: an informal alliance that had dominated Rome collapsed into direct confrontation between its two surviving members.
The conquest of Gaul
Caesar’s conquest of Gaul, from 58 to 50 BCE, is the military achievement on which his reputation chiefly rests, and the campaign where his own account must be read most carefully. Gaul covered a large area that included much of modern France and Belgium and parts of neighboring countries, inhabited by many different peoples who did not form a single state. Caesar’s own Commentaries on the Gallic War describe the campaigns year by year, presenting his decisions as necessary, lawful, and successful. That account is invaluable because it was written by the commander himself and close to the events, but it is also advocacy. It defends his actions to readers in Rome and minimizes setbacks. Historians therefore use it alongside later writers, archaeology, and coins and inscriptions, rather than treating it as a neutral report.
The main outline, as summarized by Britannica, is clear. Caesar defeated a series of Gallic peoples, extended Roman control to the English Channel and the Rhine, built a bridge across the Rhine, and invaded Britain in expeditions in 55 and 54 BCE that established a Roman presence without creating a lasting province. The decisive moment came in 52 BCE at Alesia, where the Gallic leader Vercingetorix surrendered after a siege. By 51 BCE, organized resistance was largely broken, although Britannica dates the conquest as a whole to 58 to 50 BCE.
This article gives no single casualty figure for Gaul as settled fact. Ancient figures for Gallic dead and enslaved vary widely, come from writers with political motives, and cannot be checked against census records that do not survive. The wars were long, destructive, and profitable for Rome and for Caesar personally, brought a vast new territory under Roman rule, and gave Caesar a veteran army loyal to him personally as much as to the state. Without Gaul, there would have been no Caesar as dictator.
Crossing the Rubicon and winning the civil war
In early January 49 BCE, Caesar crossed the Rubicon, a small river marking the boundary between his province of Cisalpine Gaul and Italy proper, at the head of an army. Under Roman law, a general was not supposed to bring an army into Italy, so the crossing was an open defiance of the Senate and the beginning of civil war. Britannica gives that sequence directly: with his command expiring and the Gallic Wars largely concluded, the Senate ordered Caesar to relinquish his command and return to Rome, and Caesar openly defied the Senate by crossing the Rubicon and marching toward Rome.
The phrase often given in Latin as Alea iacta est, meaning the die is cast, is traditionally attributed to Caesar at that moment. Treat it as tradition, not as a recorded transcript. No contemporary stenographer stood on the riverbank, and ancient writers report famous sayings of this kind as part of their portrait of a man, not as verbatim records. The crossing itself is not in doubt, and its symbolism has lasted because the act was unmistakable: once an army entered Italy, negotiation had failed and war had begun.
The civil war of 49 to 45 BCE was fought across the Mediterranean world, not only in Italy. Pompey left Italy, gathered forces in the East, and was decisively defeated by Caesar at Pharsalus in Greece in 48 BCE. Pompey then fled to Egypt, where he was murdered on his arrival, drawing Caesar into Egyptian politics. In Alexandria, Caesar became involved with Cleopatra VII, helped restore her to power, and fathered a son with her, Ptolemy Caesar, commonly called Caesarion. Britannica is explicit: Caesar did not marry Cleopatra. He was married to Calpurnia at the time. After Pharsalus, Caesar still had to defeat Pompey’s sons and remaining supporters, in campaigns in Africa and Spain ending with the battle of Munda in 45 BCE. He had pardoned many enemies, a policy of clemency that did not protect him, since several pardoned men later joined the conspiracy against him.
Dictator, reformer, and the Julian calendar
Once in control, Caesar held the dictatorship, an old Roman emergency office, first for limited periods and then, in early 44 BCE, for life. He combined that office with consulships and other powers, and used his position to carry out reforms. Britannica summarizes the program as political and social reforms that helped lay the groundwork for imperial rule, listing a new calendar, a reduced grain dole, settlement of veterans in new colonies, a greatly enlarged Senate, and extended citizenship for communities in Spain and what is now northern Italy.
The calendar reform is the most lasting. The old Roman calendar had drifted out of step with the seasons and could be manipulated for political purposes by inserting extra months. Caesar, advised by astronomers, replaced it with a solar calendar of 365 days with an extra day in leap years, the Julian calendar, which took effect in 45 BCE. Britannica notes that the Julian calendar is still partially in force in Eastern Orthodox Christian countries, and that the Gregorian calendar now in use in the West is the Julian calendar slightly corrected by Pope Gregory XIII. The month of July also takes its name from Caesar: the Roman month Quintilis, the month of his birth, was renamed July in his honor. Those two facts are the most direct survivals of Caesar in everyday modern life.
The other reforms were more political. Enlarging the Senate brought in new men from Italy and the provinces, diluted the power of the old aristocracy, and filled the Senate with men who owed their positions to Caesar. Extending citizenship bound new communities to Rome. Settling veterans in colonies addressed soldiers returning with no land or livelihood. Reducing free grain addressed the cost of feeding Rome’s urban population. None of these measures was purely generous or purely self interested. Caesar was trying, in a short period, to repair institutions that had been failing for decades, by personal authority rather than through the shared institutions he was repairing. That tension is at the center of why he was killed.
The assassination on the Ides of March
On March 15, 44 BCE, the Ides of March in the Roman calendar, a group of senators assassinated Caesar in the Senate House in Rome. Britannica’s summary is the safest short version: the plot was led by Gaius Cassius Longinus and Marcus Junius Brutus, it reportedly involved some 60 men, and the conspirators claimed that Caesar’s accumulation of power, including his appointment as dictator, threatened the Roman Republic. The word reportedly matters. Ancient sources differ on the exact number of conspirators, and a round number should not be presented as an exact headcount.
Suetonius, the fullest ancient biographical source for the assassination, reports that Caesar was stabbed with twenty three wounds, that he uttered not a word but merely a groan at the first stroke, and that some writers reported that when Marcus Brutus rushed at him, he said in Greek, “You too, my child?” Suetonius presents that phrase as a report by others, not as a fact he guarantees. The Latin line “Et tu, Brute?” meaning “You too, Brutus?” comes from William Shakespeare’s play Julius Caesar, written more than sixteen centuries later, and should not be quoted as Caesar’s historical last words. Shakespeare’s play also popularized the warning “Beware the Ides of March,” a phrase Britannica notes the play made famous. The play is powerful literature, not a historical record, and its dialogue should never be cited as evidence for what happened in the Senate House.
Fear of monarchy was central: Caesar’s lifetime dictatorship, his honors, and his portrait on coins made many senators believe the republic was already lost and that only his death could restore it. Personal grievances and disappointed ambition also played parts. What they did not do was restore the republic. Caesar’s death began a new round of civil wars, in which his supporters, led by Mark Antony and Octavian, defeated the assassins, then fought each other, until Octavian emerged as sole ruler. The assassination therefore failed on its own terms.
Suetonius also reports episodes modern writers have interpreted as seizures, but those are ancient observations, not a modern diagnosis, and this article gives none.
What happened after Caesar: from republic to empire
Caesar’s death did not restore the republic, and it did not immediately create the empire. It created a power vacuum filled, after more than a decade of war, by his adopted heir. Caesar’s will adopted his great nephew Octavian, later known as Augustus, as his son and heir, giving Octavian the name Caesar and a powerful political inheritance. Octavian, with Mark Antony and Lepidus, formed the Second Triumvirate, defeated the assassins at Philippi in 42 BCE, and then, after that alliance broke down, defeated Antony and Cleopatra at Actium in 31 BCE. Octavian then consolidated power and transformed the republic into the Roman Empire as its first emperor, while preserving many republican forms and titles.
That sequence explains why Caesar is sometimes called the founder of the empire even though he was not its first emperor. He created the conditions, precedents, and political vocabulary that Augustus later used, and his name became the title Augustus and his successors carried. The end of the republic cannot be dated to a single day. It unraveled across a century of civil war, reform, and concentration of power, and Caesar’s career was the decisive phase in that unraveling, not the whole story by itself.
How we know about Caesar, and why the sources need care
Caesar is unusually well documented for an ancient figure, but the documentation has clear limits. First, Caesar’s own writings. His Commentaries on the Gallic War and on the Civil War survive and give a commander’s account in his own voice. They are primary sources in the sense that Caesar wrote them, but they are not impartial. They were written to justify his actions to readers in Rome and to build his reputation. Quoting Caesar on his own motives without noting that interest is repeating advocacy, not independent evidence.
Second, contemporary writers. Cicero’s letters and speeches, by a man who knew Caesar and opposed many of his actions, give a contemporary view from inside Roman politics, but Cicero had his own biases. Sallust, a historian of the next generation, wrote about the politics of Caesar’s youth and the conspiracy of Catiline, in which Caesar played a debated part. These writers help correct Caesar’s self portrait, but they are not neutral transcripts either.
Third, later biographers. Suetonius, writing in the early second century CE, about 150 years after Caesar’s death, collected anecdotes, documents, and gossip about his life and sayings, including the pirate story, the Alexander story, and the assassination account used here. Plutarch, a Greek writer of about the same period, wrote a parallel life of Caesar paired with Alexander. Both had access to sources now lost, and both repeated stories that cannot now be verified. Any detail that appears only in Suetonius or Plutarch should be labeled as their report, not as a settled fact.
Fourth, material evidence. Coins struck in Caesar’s lifetime and shortly after his death show his portrait and titles, and they are valuable because they were public objects, not private memoirs. Portraits in stone are harder to use. The Museum of Classical Archaeology at the University of Cambridge holds a cast of a head long associated with Caesar, but its own record describes the head as a forgery: lacking provenance, without a strong resemblance to other portraits of Caesar, and with incised pupils anachronistic for the first century BCE. The Metropolitan Museum of Art notes that coin images were often copied onto ring stones, which explains why many later images look alike without necessarily being likenesses taken from life.
That caution applies to quotations. “Veni, vidi, vici,” meaning “I came, I saw, I conquered,” is traditionally attached to Caesar’s victory at Zela in 47 BCE, not recorded by a stenographer. “Alea iacta est,” the die is cast, is traditionally attached to the Rubicon crossing, with the same qualification. “Et tu, Brute?” is Shakespeare, not Suetonius.
Two popular confusions, cleared up
The Caesar salad has nothing to do with Julius Caesar. Britannica states this plainly: the salad was invented in 1924 by Caesar Cardini, an Italian restaurant owner in Tijuana, Mexico. Caesar was also not born by Caesarean section, despite the tempting similarity of names. The operation was known in the ancient world, mainly as a procedure performed when the mother had died, and Caesar’s mother Aurelia lived long after his birth, which makes the story impossible in its usual form. The name Caesar almost certainly came from a family name that predated Julius Caesar himself. Shakespeare’s Julius Caesar fixed the images of Brutus, Cassius, Mark Antony, and the Ides of March in English speaking culture, and Mark Antony’s funeral speech is Shakespeare’s invention, not a transcript of a Roman funeral oration.
Frequently asked questions
Was Julius Caesar an emperor?
No. Caesar was a Roman dictator, not an emperor, holding the dictatorship first for limited periods and then for life from early 44 BCE. The first emperor was his adopted heir Octavian, later called Augustus.
When was Julius Caesar born and when did he die?
He was born in Rome in about 100 BCE, on July 12 or 13 by the traditional dating, which Britannica presents with a question mark because the date has long been disputed. He died in Rome on March 15, 44 BCE, assassinated on the Ides of March.
What is Julius Caesar best known for?
Conquering Gaul from 58 to 50 BCE, winning the civil war of 49 to 45 BCE against Pompey and his supporters, and ruling Rome as dictator from 46 to 44 BCE while carrying out reforms that included the Julian calendar.
How did Julius Caesar die?
He was assassinated by senators in the Senate House in Rome on March 15, 44 BCE. The plot was led by Cassius and Brutus and reportedly involved some 60 men. Suetonius reports twenty three wounds. His death did not restore the republic.
Did Julius Caesar marry Cleopatra?
No. He had a relationship with Cleopatra VII, fathered a son with her, Ptolemy Caesar, called Caesarion, and helped restore her to power. He did not marry her. He was married to Calpurnia at the time.
What was the First Triumvirate?
An informal political alliance formed in 60 BCE among Caesar, Pompey, and Crassus, who agreed to support one another and dominate Roman politics together. It was not a formal office created by law, and it broke down after Crassus died in 53 BCE.
What did Caesar write?
Accounts of his own campaigns, the Commentaries on the Gallic War and on the Civil War, in clear Latin prose still read today. They are valuable as a commander’s account, but they are also self interested advocacy, not neutral histories.
What is the Julian calendar?
The solar calendar introduced by Caesar to replace the old Roman calendar, which had drifted out of step with the seasons. It had 365 days with an extra day in leap years, took effect in 45 BCE, and July is named for Caesar. The Gregorian calendar is the Julian calendar slightly corrected.
Did Julius Caesar really say “Et tu, Brute?”
Not in that form, as far as the surviving evidence shows. Suetonius reports that some writers said Caesar spoke a Greek phrase, “You too, my child?” but presents that as a report by others, and also reports that Caesar uttered only a groan at the first stroke. The Latin line comes from Shakespeare’s play.
Why does Julius Caesar still matter?
His career marks the decisive break between the Roman Republic and the Roman Empire, his calendar reform still affects daily life, and his name, writings, and image have shaped how later ages have thought about power, ambition, and dictatorship.
Sources & references
- Encyclopaedia Britannica. Julius Caesar, Roman ruler. https://www.britannica.com/biography/Julius-Caesar-Roman-ruler
- Museum of Classical Archaeology, University of Cambridge. Head of Julius Caesar (forgery), collection record 497. https://museum.classics.cam.ac.uk/collections/casts/head-julius-caesar-forgery
- The Metropolitan Museum of Art. Roman Art, educator material, including Suetonius on Caesar's appearance and the use of coin portraits on ring stones. https://www.metmuseum.org/zh/-/media/files/learn/for-educators/publications-for-educators/roman.pdf
- Suetonius. Lives of the Caesars, Life of Julius Caesar, English translation by J. C. Rolfe, hosted by LacusCurtius at the University of Chicago. https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Julius*.html
