Iago is a Shakespearean villain from the play Othello. He is a manipulative and deceitful character who plots to ruin the life of the protagonist, Othello. Iago is often considered one of the most complex and intriguing villains in all of Shakespeare's works. He is known for his Machiavellian tactics and his ability to manipulate those around him. He is also known for his famous line 'O, beware, my lord, of jealousy; It is the green-eyed monster which doth mock the meat it feeds on.'