In Janurary of 49 BC, [[Julius Caesar]] crossed the Rubicon River in Northern Italy and proclaimed "alea iacta est" or "the die is cast." This was an act of treason against the Roman Republic, and so Caesar began his civil war against [[Pompey]].
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Caesar went on to crush the legions of Pompey, and then used his legions to force the Senate to declare him Dictator for life. In 44 BC, in a conspiracy led by Brutus, Julius Caesar was assassinated by a number of senators. His assassination outraged up the public, and led to the conditions for the the republic to replaced by an empire.
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Caesar left his wealth to his adopted son, Octavian (later renamed [[Augustus Caesar]]). Octavian allied himself with Mark Antony and Lepidus. The three of them formed the Second Triumvirate and effectively ruled Rome. The ambitions of each member tore the alliance apart, forcing Lepidus to exile and leading to Mark Antony's suicide, leaving Octavian as the sole ruler of Rome. It took several years for Octavian to set up his government, but he ultimately ended the Roman Republic by 27 BC, reforming the Roman Republic in the [[Roman Empire]].