As the scene opens, the Romans are celebrating their victory with flying chest bumps and stuff.
Caius Martius is super embarrassed by all the attention and refuses to take his share (one tenth) of the war spoils.
This, of course, makes him an even bigger rock-star. While the crowd of soldiers cheers him on, Martius gives a modest little victory speech about how he was just doing his military duty.
Cominius declares that Caius Martius is so getting a new nickname name for his service to Rome. From here on out, he'll be called "Caius Martius Coriolanus." You know, after the city he just destroyed.
(Ah ha! Now we know why this play is titled Coriolanus.)
Next, Caius Martius Coriolanus says he really wants to help out a Volscian guy (some poor plebian) who was nice to him during his stay in Corioles. The only problem is, he can't remember the dude's name.
Then he's all, "Oops! Oh, well" and runs off to wash all the sticky blood from his face.