What Roman general of the late republic brought his legions across the Rubicon River as a sign of opposition to the Senate and the proconsul Pompey?

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Julius Caesar famously crossed the Rubicon River in 49 BC with his legions, violating Roman law and sparking a civil war against the Senate and the forces of Pompey, who had been appointed proconsul of the region. This event marks the beginning of Caesar's rise to power and the end of the Roman Republic.

What Roman General of the Late Republic Brought His Legions