A young, charming, and handsome soldier, whom Othello promotes to the rank of lieutenant, over the more experienced Iago. Cassio is loyal to Othello and friendly with Desdemona, though he's unkind to the prostitute Bianca, who seems to love him. While intelligent, he is not cunning, and Iago easily ensnares the unwitting Cassio in a plot to convince Othello that Desdemona has cheated on him with Cassio.