At the start of the play Othello, a Moorish general in the army, promotes Cassio to lieutenant. Iago, his ensign, is angry and jealous, so he plots against Cassio by making him look bad and making Othello uncertain about keeping him as his lieutenant. Some of the things he does are to get him drunk and to start a fight with someone else from the army. Iago also tells Othello that his wife, Desdemona, is cheating on him with Cassio. Cassio is demoted and Iago is promoted to lieutenant. Othello kills Desdemona and is then told by Iago's wife, Emilia, that Iago plotted against him. He goes after Iago, and injures him but does not kill him. He then kills himself next to his wife after telling Emilia to say sorry to Cassio for what he has done.