Othello appoints Iago as his lieutenant and instructs him to kill Cassio within three days. Othello vows to kill his wife Desdemona himself for her supposed affair. Later, Othello demands to see a handkerchief that was his first gift to Desdemona but she has lost it. Iago plans to give Othello proof of an affair between Cassio and Desdemona. He has Othello hide while he talks to Cassio, whose bragging makes Othello believe the "her" they refer to is Desdemona, though they are really discussing Cassio's prostitute lover Bianca.