Tyrant - A ruler who has absolute power and is cruel and oppressive
Cassius suggests that Caesar will be a tyrant if he's given the power, even if he doesn't start out as one: "I know he would not be a wolf / But that he sees the Romans are but sheep”
The Caesar that Brutus describes in his speech and the Caesar that Antony describes are the same man, but Antony is better able to make the audience see Caesar as someone who would never have resorted to tyranny
Brutus believes that it’s necessary to kill Caesar because otherwise he might become a tyrant; however, this belief isn’t shared by other characters like Portia or Octavius.