Final answer:
Plutarch claimed that after Antony's speech, the crowd turned against the conspirators of Julius Caesar's assassination.
Step-by-step explanation:
According to Plutarch, after Mark Antony's speech following the assassination of Julius Caesar, the crowd turns against the conspirators. Plutarch's writings indicate that Antony's oratory skills and the way he presented Caesar's murder to the public fueled the fire of discontent against the assassins, leading to an outbreak of violence towards the conspirators and eventually contributing to the formation of the Second Triumvirate. This pivotal moment showcases the power of rhetoric in ancient Rome and its impact on the course of Roman history.