Revenge in Central to Shakespeare’s play Othello to a very large extent. The entire play is shaped around revenge. Iago, who is seen as Shakespeare’s greatest villain is fueled by revenge. Iago has jealousy over Cassio’s position and has suspicions towards both Cassio and Othello of adultery with his wife Emilia. Out of vengeance Iago uses his ability to manipulate Othello and build.