Marc Anthony's speech in Shakespeare's Julius Caesar has a powerful purpose, audience, and message. The purpose of his speech is to sway the crowd and turn them against the conspirators who killed Caesar. His audience is the Roman citizens who are gathered at Caesar's funeral. The message he conveys is that Caesar was not ambitious, but a noble and honorable leader who cared deeply for Rome. He uses persuasive rhetoric to evoke emotions and provoke the crowd to seek justice for Caesar's death.