In the tragedy Othello, Iago convinces Othello, the general of the army, that his wife, Desdemona, has been unfaithful to him. In reality, Desdemona is innocent and faithful. Iago is driven by jealousy, as another man, Cassio, was promoted instead of him. He is also convinced that Othello has slept with his wife, Emilia. The play reaches a tragic end with Iago successfully deceiving and manipulating Othello, who doesn't learn of the trickery until it is too late.