Iago decides to sabotage Othello and Cassio out of bitterness over being passed up for a promotion. He stirs up Roderigo's jealousy of Othello's marriage to Desdemona and awakens her father Brabantio with claims of elopement. Brabantio is enraged but Othello and Desdemona convince the Duke of their love. Othello is called away to fight invaders in Cyprus, leaving Desdemona in Iago's care until she can join him. Iago plots to undermine Othello and Cassio.