How did ancient Roman law regulate weapons crossing the Rubicon?

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Ancient Roman law did not specifically regulate the transport of weapons across the Rubicon; rather, it prohibited a general from leading an army out of his assigned province and into Italy proper.12

The legal restriction was governed by the Lex Cornelia Majestatis, which forbade military commanders from crossing the boundary of their assigned province with their troops. When Julius Caesar crossed the river in 49 BCE, he was not violating a specific "weapons" regulation, but rather committing an act of treason and a declaration of war against the Roman Senate by bringing his military force into the heart of Roman territory. This act of defiance effectively bypassed the legal authority of the state, leading to a civil war.231