Through examples from Othello, show Iago as a monster of villainy.

Iago is a monster of villainy. He hates Othello for not
making him his lieutenant; therefore, he is determined to ruin Othello's life. He plants
seeds of jealousy. Iago creates an affair between Desdemona and Cassio. Although there
is nothing going on between Cassio and Desdemona, Iago makes it seem that there is an
affair between the two of them.

First, he plants the idea
for Cassio to ask for Desdemona's help in reinstating Cassio to his position as
lieutenant. When Desdemona pleads with Othello for Cassio's reinstatement, Othello
becomes suspicious. Of course, Iago is there to plant seeds of
suspicion.

Next, Iago takes Desdemona's handkerchief and
plants it on Cassio. Iago tells Othello that he has seen Cassio wiping his beard with
the handkerchief that was a gift of Othello's love to
Desdemona.

Iago then claims that he will speak to Cassio
about his affair with Desdemona. Othello is observing from a distance. When Iago and
Cassio begin to talk of Cassio's affair with his mistress, Bianca, Othello thinks they
are talking about Desdemona. Fury overtakes Othello. In Act 4, Scene 1, Iago states that
his medicine is working:

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Work on,
My medicine, work! Thus
credulous fools are caught:
And many worthy and chaste dames even thus,

All guiltless, meet reproach. What, ho! My lord!
My lord, I say!
Othello!

Iago has planted
enough seeds of distrust until Othello turns on Desdemona and smothers her. Iago is a
villian. He has done all the damage he can do. Othello has lost his senses to jealousy
because of Iago's villainous lies.