Prince Escalus makes a few dramatic speeches in the play: there are three distinct points where he addresses both the Capulet and Montague families.
The first is in Act I, Scene i when the fight happens in the streets. He yells at everyone to go home and says he will speak to Montague and Capulet privately and separately.
The second happens in Act III, Scene i, after Tybalt has killed Mercutio and Romeo has killed Tybalt. In this speech he again yells at the families and banishes Romeo.
The third happens at the end of the play, Act V, Scene iii, after Juliet and Romeo are discovered dead. He tells the families that "all are punished", meaning all will suffer greatly.