The phrase "crossing the Rubicon" is an idiom that means "passing a point of no return". Its meaning comes from allusion to the crossing of the river Rubicon by Julius Caesar in early January 49 BC. The exact date is unknown. Scholars usually place it on the night of 10 and 11 January because of the speeds at which messengers could travel at that time. It is often asserted that Caesar's crossing of the river precipitated Caesar's civil war; however, Caesar's... more
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