"That Tiber trembled underneath her banks to hear the replication of your sounds" (1:1: Ln 46-47)
Act II: Sc 1
"Give me your hands all over, one by one." (2:1: Ln 111)
Act III: Sc 1
"Et tu, Brute? Then fall, Caesar." (3:1: Ln 79)
In Scene 1 Marullus and Flavius are angry with the Romans. The Romans are in the streets celebrating Pompey's death. Caesar had defeated his sons. Marullus and Flavius tear down decorations to ruin the celebration.
Act IV: Sc III
"Thou shalt see me at Philippi." (IV:III: Ln 282)
"This was the noblest Roman of them all." (V:V: Ln 68)
The conspirators meet at Brutus's house to make a plan. Cassius suggest to kill Caesar before he is crowned. All the conspirators include Brutus,Cassius,Casca,Decius,Metellus,Trebonius,and Cinna. Brutus agrees to join the conspiracy because he loves Rome not because of his feelings toward Julius.
Act V: Sc
The conspirators walk Caesar to the Senates. As Caesar speaks Cinna gives the signal to kill him. All the conspirators join in as Caesar dies. Caesar is mostly shocked that his best friend Brutus is envolved in this.
"So call the field to rest, and let's away To part the glories of this happy day." (V:V: Ln 80-81)
Brutus and Cassius flee the town as Romans turn against them. As the gather an army to fight against Octavious and Antony they try to get some rest. Brutus can't sleep so he sings himself a song. Caesar's ghost appears and warns him that he shall see him at Philippi. We can infer that it means Brutus will die.
As this war starts Cassius believes he sent one of his men to death. He kills himself because of this. Turns out it was Brutus's forces and he was in no danger. Brutus also kills himself because his army was losing. At the end Antony and Octavious mourn Brutus's death because he was the only one who truely cared about the Romans.
The theme to Julius Caesar is that all mistakes have consequences. Cassius was the one who had the idea to kill Julius. Cassius was also the first one from their side to die. Brutus was an honorable man but what he did was wrong maybe he had a right reason but it was wrong and he paid the consequences. All the conspirators paid the price for Caesar's death.