The citizens of Rome are celebrating Caesar's triumph over Pompey. During the celebration, the soothsayer warns Caesar of the 15th of March. Caesar dismisses the man as crazy and ignores his warning.
Cassius discusses with Brutus how Caesar is merely a man even though he is treated like a god. Cassius believes that Caesar will be come too ambitious if he rises to power. Therefore, Cassius convinces Brutus that Caesar must die for the good of Rome.
Caesar ignores all warnings concerning his death. First, his wife, Calpurnia, begs Caesar not to go to the Senate because of the terrible dreams she had about him being killed; Caesar leaves anyway despite her warnings. Caesar also ignores Artemidorus's letter which told him about the people conspiring against him.
When Caesar arrives at the Senate, the conspirators speak to Caesar and surround him. Then, they each stab him one by one. Caesar sees his friend, Brutus, among his assassins and then dies tragically.
Et tu, Brute?
Antony and Octavius raise an army to fight Brutus and Cassius; they seek revenge for Caesar's death. This leads to a battle between the two armies in Philippi.
Antony and Octavius win the battle of Philippi. Both Cassius and Brutus had killed themselves before the battle was over. Antony acknowledges that Brutus was a noble man because he had honorable intentions when he killed Caesar.