Final answer:
Cassius is planning the assassination of Julius Caesar in the closing scenes of Shakespeare's play. The conspirators, including Cassius, rationalize their plan as a means to preserve Roman freedom against Caesar's assumed tyranny.
Step-by-step explanation:
In the closing scenes involving Cassius in Shakespeare's play Julius Caesar, Cassius is planning the assassination of Julius Caesar. Fueled by a fear of Caesar's growing power and despotism, as well as by concerns that Caesar may overthrow the Republic, Cassius, along with Brutus and other senators, conspires to kill Caesar.
This act, which they rationalize as necessary for the preservation of Roman freedom and the republic, leads to the infamous murder on the Ides of March, 44 BCE. The conspiracy culminates in the dramatic stabbing of Caesar in the Senate, an event that significantly alters the course of Roman history.