Final answer:
In William Shakespeare's play, Popilius Lena approaches Cassius and Brutus before Caesar's assassination, expressing a wish for the success of their 'enterprise,' hinting he might know about the conspiracy.
Step-by-step explanation:
The character Popilius does not have any lines as he enters the Senate House just before Caesar is assassinated. However, there is a moment in William Shakespeare's play Julius Caesar, where Popilius Lena, while on his way to the Senate, greets Caesar and then approaches Cassius and Brutus, saying, "I wish your enterprise today may thrive" or words to that effect, indicating he might know about the conspiracy against Caesar. This causes tension among the conspirators who fear their plan has been discovered.