What event of ancient Roman history is associated with the catch phrase “to cross the Rubicon”?

Caesar approached the Rubicon River, which separated Gaul from Italy. There he pondered and said: “The die is cast.” He moved to Rome and seized power there.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.