Iago is arrested and brought to justice at the end of Othello.
Iago is arrested and brought to justice when he is found guilty of murdering Cassio, and sentenced to death by hanging. The people of Venice are so upset about what he has done that they demand that he be executed immediately, but the Duke decides that it would be better if Iago were put on trial first, so that he could explain why he committed such terrible crimes.
The Duke then calls for a trial for Iago, in which he will be able to defend himself against charges of murder and conspiracy. All the main characters from the play attend this trial: Othello, Desdemona, Emilia (Iago’s wife), Roderigo (his lover), Cassio (his victim), Brabantio (who lost his daughter through Iago’s treachery), Lodovico (the Venetian ambassador who has come back from Cyprus with news about how well things have turned out there thanks to Othello’s rule) and even Bianca (who was saved from being raped by Roderigo by Emilia).