It is just a few hours before dawn, and Brutus has not decided whether or not he's going to join the conspirators. He recives the letters, and decides to join them.
Lucuis gives Brutus the letters. The conspirators meet up at Brutus' house and decide how they're going to kill Caesar.
Calpurnia had a bad dream where she saw a statue of Caesar with blood coming out of a hundred spouts and the Romans were bathing their hands in it. She proceeds to beg Caesar to stay home and not go.
Decius convinces Caesar to go by telling him that maybe the dream was interpreted, or maybe that if he doesn't go today, he won't be offered the crown ever again. Then he tells him that he may be thought of as a coward if he doen't go.
Artemidorus, who is a supporter of Caesar, learned about the plot to kill Caesar. He writes Caesar a letter to warn him.
Portia, who is Brutus' wife, sends their servant boy, Lucius, to the capitol to see what's happening. Portia meets the soothsayer, the same one who warned Caesar "Beware the Ides of March."