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Gaius Iulius CaesarOfficial name after 42 BC, Gaius Iulius Caesar Divus (Latin script: GAIVS IVLIVS CAESAR) (in inscriptions IMP•C•IVLIVS•CAESAR•DIVVS), in English, "Imperator and God Gaius Julius Caesar". Also in inscriptions, Gaius Iulius Gaii Filius Gaii Nepos Caesar, in English, "Gaius Julius Caesar, son of Gaius, grandson of Gaius". or Gaius Julius Caesar in modern English spelling ( in Classical Latin, and later ; conventionally in English), July 13, 100 BC – March 15, 44 BC,) was a Roman military and political leader. He played a critical role in the transformation of the Roman Republic into the Roman Empire.

A politician of the populares tradition, he formed an unofficial triumvirate with Marcus Licinius Crassus and Gnaeus Pompeius Magnus which dominated Roman politics for several years, opposed in the Roman Senate by optimates like Marcus Porcius Cato and Marcus Calpurnius Bibulus. His conquest of Gaul extended the Roman world to the Atlantic Ocean, and he also conducted the first Roman invasion of Britain in 55 BC. The collapse of the triumvirate, however, led to a stand-off with Pompey and the Senate. Leading his legions across the Rubicon, Caesar began a civil war in 49 BC from which he became the undisputed master of the Roman world.

After assuming control of government, he began extensive reforms of Roman society and government. He was proclaimed "dictator in perpetuity" (dictator perpetuo), and heavily centralised the bureaucracy of the Republic. A group of senators, led by Caesar's former friend Marcus Junius Brutus, assassinated the dictator on the Ides of March (March 15) in 44 BC, hoping to restore the normal running of the Republic. However, the result was another Roman civil war, which ultimately led to the establishment of a permanent autocracy by Caesar's adopted heir, Gaius Octavianus. In 42 BC, two years after his assassination, the Senate officially sanctified Caesar as one of the Roman deities.

Much of Caesar's life is known from his own Commentaries (Commentarii) on his military campaigns, and other contemporary sources such as the letters and speeches of his political rival Cicero, the historical writings of Sallust, and the poetry of Catullus. Many more details of his life are recorded by later historians, such as Appian, Suetonius, Plutarch, Cassius Dio and Strabo.

Early life

Caesar was born into a patrician family, the gens Julia, which claimed descent from Iulus, son of the legendary Trojan prince Aeneas, supposedly the son of the goddess Venus. The cognomen "Caesar" originated, according to Pliny the Elder, with an ancestor who was born by caesarean section (from the Latin verb to cut, caedo, caedere, cecidi, caesum). The Historia Augusta suggests three alternative explanations: that the first Caesar had a thick head of hair (Latin caesaries); that he had bright grey eyes (Latin oculis caesiis); or that he killed an elephant (caesai in Moorish) in battle. Caesar issued coins featuring images of elephants, suggesting that he favoured this interpretation of his name. image:Young Folks' History of Rome illus254.png