Final answer:
Mark Antony is the second person to speak to the crowd after Caesar's assassination, as depicted in Shakespeare's play Julius Caesar. Antony's speech incites the people against the conspirators, setting the stage for the rise of Octavian as Augustus after the fall of the Second Triumvirate.
Step-by-step explanation:
The second person to speak to the crowd after Caesar's assassination is Mark Antony. This event is famously dramatized in William Shakespeare's play Julius Caesar, where Antony delivers a powerful speech that sways the public opinion against the conspirators who killed Caesar. After the assassination, the power struggle in Rome continues and ultimately leads to the rise of Octavian, Caesar's adopted son and heir, who forms the Second Triumvirate with Mark Antony and Lepidus. Despite their initial cooperation, tensions between Octavian and Antony eventually lead to the end of the triumvirate and the establishment of Octavian as Augustus, the first Roman emperor.