Caesar was the go-between for Crassus and Pompey. They had been at odds for years, but Caesar tried to reconcile them. Between the three of them, they had enough money and political influence to control public business. This informal alliance, known as the First Triumvirate (rule of three men), was cemented by the marriage of Pompey to Caesar's daughter Julia. Caesar also married again, this time to Calpurnia, who was the daughter of another powerful senator.
Caesar proposed a law for the redistribution of public lands to the poor, a proposal supported by Pompey, by force of arms if need be, and by Crassus, making the triumvirate public. Pompey filled the city with soldiers, and the triumvirate's opponents were frightened.
With the agreement of his partners, Caesar became the governor of Gallia (Gaul). Gaul is the area which is today's Northern Italy, Switzerland, and France.
Caesar was the commander of the Roman legions during the Gallic War. The war was fought on the side of Rome's Gallic clients against the Germans, who wanted to invade Gaul. It was also to extend Rome's control of Gaul. Caesar's conquest of Gaul extended Rome's territory to the North Sea. In 55 BC he conducted the first Roman invasion of Britain. Caesar wrote about this eight-year war in his book "De Bello Gallico" ('About the Gallic Wars'). This book, written in Latin, is an important historical account.
These achievements got him great military power, and threatened to eclipse Pompey. The balance of power was further upset by the death of Crassus in 53 BC.
In 50 BC, the Senate, led by Pompey, ordered Caesar to disband his army and return to Rome because his term as governor had finished. Caesar thought he would be prosecuted if he entered Rome without the immunity enjoyed by a magistrate. Pompey accused Caesar of insubordination and treason.
Caesar and his army approached Rome and "crossed the Rubicon", a shallow river in north-east Italy, in 49 BC. It was the point beyond which no army was supposed to go. The river marked the boundary between Cisalpine Gaul to the north, and Italy proper to the south. Crossing the Rubicon caused a civil war. Pompey, the lawful Consul, and his friends, fled from Rome as Caesar's army approached.
Pompey managed to escape before Caesar could capture him. Caesar decided to head for Spain, while leaving Italy under the control of Mark Antony. Caesar made an astonishing 27-day route-march to Spain, where he defeated Pompey's lieutenants. He then returned east, to challenge Pompey in Greece. There, in July 48 BC, at Dyrrhachium Caesar barely avoided a catastrophic defeat. He then decisively defeated Pompey, at the Battle of Pharsalus later that year.
In Rome, Caesar was appointed Dictator, with Mark Antony as his Master of the Horse (second in command). Caesar presided over his own election to a second consulship and then, after eleven days, resigned this dictatorship.
Late in 48 BC, he was appointed dictator again, with a term of one year. Caesar then pursued Pompey to Egypt, where Pompey was soon murdered. Caesar then became involved in an Egyptian civil war between the child pharaoh and his sister, wife, and co-regent queen, Cleopatra. Perhaps as a result of the pharaoh's role in Pompey's murder, Caesar sided with Cleopatra. He is reported to have wept at the sight of Pompey's head, which was offered to him by the pharaoh as a gift. In any event, Caesar defeated the pharaoh's forces in 47 BC and installed Cleopatra as ruler.
Caesar and Cleopatra celebrated their victory with a triumphant procession on the Nile in the spring of 47 B.C. The royal barge was accompanied by 400 additional ships, introducing Caesar to the luxurious lifestyle of the Egyptian pharaohs. Caesar and Cleopatra never married; Roman Law only recognized marriages between two Roman citizens. Caesar continued his relationship with Cleopatra throughout his last marriage, which lasted 14 years – in Roman eyes, this did not constitute adultery – and may have fathered a son called Caesarion. Cleopatra visited Rome on more than one occasion, staying in Caesar's villa, outside Rome across the River Tiber.
In 46 BC, Caesar defeated Cato and the remnants of Pompey's supporters in Africa. He was then appointed dictator for ten years. In two years he made numerous changes in Roman administration to improve the Republic. Many of these changes were meant to improve the lives of ordinary people. One example, which has lasted, was his reform of the calendar into the present format, with a leap day every four years. In February of 44 BC, one month before his assassination, he was appointed Dictator for life.
On the Ides of March (15 March; see Roman calendar) of 44 BC, Caesar was due to appear at a session of the Senate. Mark Antony, fearing the worst, went to head Caesar off. The plotters expected this, and arranged for someone to intercept him.
According to Eutropius, around sixty or more men participated in the assassination. He was stabbed 23 times. According to Suetonius, a physician later established that only one wound, the second one to his chest, had been lethal.
The dictator's last words are not known with certainty, and are a contested subject among scholars and historians alike. The version best known in the English-speaking world is the Latin phrase "Et tu, Brute?" ('You too, Brutus?'). In Shakespeare's "Julius Caesar", this is the first half of the line: ""Et tu, Brute?" Then fall, Caesar".
According to Plutarch, after the assassination, Brutus stepped forward as if to say something to his fellow senators; they, however, fled the building. Brutus and his companions then marched to the Capitol while crying out to their beloved city: "People of Rome, we are once again free!". They were met with silence, as the citizens of Rome had locked themselves inside their houses as soon as the rumour of what had taken place had begun to spread.
A wax statue of Caesar was erected in the forum displaying the 23 stab wounds. A crowd who had gathered there started a fire, which badly damaged the forum and the neighbouring buildings. In the ensuing chaos, Mark Antony, Octavian (later Augustus Caesar), and others fought a series of five civil wars, which would end in the formation of the Roman Empire.
The Roman empire and its emperors were so important in history that the word "Caesar" was used as a title in some European countries to mean emperor, even long after the Roman empire was gone. For example, Germany's emperor was called a " Kaiser" up to the year 1919 AD and Russia's emperor was called a Tsar until 1917 AD.
Caesar was a significant author.
Other works historically attributed to Caesar, but whose authorship is doubted, are:
These narratives were written and published on a yearly basis during or just after the actual campaigns, as a sort of "dispatches from the front". Apparently simple and direct in style—to the point that Caesar's "Commentarii" are commonly studied by first and second year Latin students—they are in fact quite sophisticated, aimed at the middle-brow readership of minor aristocrats in Rome, Italy, and the provinces.
Based on remarks by Plutarch, Caesar is sometimes thought to have suffered from epilepsy. Modern scholarship is divided on the subject. It is more certain that he was plagued by malaria, particularly during the Sullan proscriptions of the 80s.
Caesar had four documented episodes of what may have been complex partial seizures. He may additionally have had "absence seizures" ("petit mal") in his youth. The earliest accounts of these seizures were made by the biographer Suetonius who was born after Caesar died. The claim of epilepsy is countered among some medical historians by a claim of hypoglycemia. This can cause seizures which are a bit like epilepsy.