Chapter: SCENE IV.
Antium. Before AUFIDIUS' house

Enter CORIOLANUS, in mean apparel, disguis'd and muffled

  CORIOLANUS. A goodly city is this Antium. City,
    'Tis I that made thy widows: many an heir
    Of these fair edifices fore my wars
    Have I heard groan and drop. Then know me not.
    Lest that thy wives with spits and boys with stones,
    In puny battle slay me.

                           Enter A CITIZEN

    Save you, sir.
  CITIZEN. And you.
  CORIOLANUS. Direct me, if it be your will,
    Where great Aufidius lies. Is he in Antium?
  CITIZEN. He is, and feasts the nobles of the state
    At his house this night.
  CORIOLANUS. Which is his house, beseech you?
  CITIZEN. This here before you.
  CORIOLANUS. Thank you, sir; farewell.             Exit CITIZEN
    O world, thy slippery turns! Friends now fast sworn,
    Whose double bosoms seems to wear one heart,
    Whose hours, whose bed, whose meal and exercise
    Are still together, who twin, as 'twere, in love,
    Unseparable, shall within this hour,
    On a dissension of a doit, break out
    To bitterest enmity; so fellest foes,
    Whose passions and whose plots have broke their sleep
    To take the one the other, by some chance,
    Some trick not worth an egg, shall grow dear friends
    And interjoin their issues. So with me:
    My birthplace hate I, and my love's upon
    This enemy town. I'll enter. If he slay me,
    He does fair justice: if he give me way,
    I'll do his country service.

 Meanwhile, Coriolanus shows up in Antium. He's looking for Tullus Aufidius so they can get together and destroy Rome. Coriolanus delivers a soliloquy about how crazy it is that he's about to become BFF's with Tullus Aufidius when not long so ago he wanted to kill the guy. He also reflects about how he used to love Rome, but now he wants to burn it to the ground. Life is just crazy like that, you know.

