⇛ The opening scene takes place on the streets of Rome. The common folk are milling around, and the tribune Flavius tells them to go home. (In Ancient Rome, a tribune was an officer who protected the interests of the lower class or common people.) Flavius says that it is not a public holiday, and if the men are on the streets they should be displaying the signs of their profession.

⇛ He interrogates two men. The first says he is a carpenter, but the second man is in a playful mood and does not answer Flavius directly. Eventually it transpires that he is a cobbler, and in answer to why he is out on the streets and not in his shop, the cobbler replies that they are all out to see Caesar, who has just returned after defeating Pompey's sons in battle. The crowd wants to rejoice in his triumph.

⇛ The second tribune, Marullus, is impatient with the crowd. He reminds them that not so long ago they were celebrating the triumphs of Pompey. He says that Romans should not celebrate Roman triumphs over other Romans, and he sends the workers home.

⇛ After the mob has gone, Flavius expresses contempt for the fickleness of the common folk. Then he tells Marullus to go about the city and remove any crowns that have been placed on the statues of Caesar. By limiting his public acclamation, they will help to prevent Caesar from growing too powerful.