A classic villain
Iago is one of William Shakespeare’s most conniving villains. He is the antagonist in Shakespeare’s drama, Othello.
An antagonist, according to Wikipedia, is a “character, group of characters, or institution, that represents the opposition against which the protagonist must contend.”
Illustration of Othello (left) and Iago from William and Mary Lamb’s Tales from Shakespeare (1901)
Photo of illustration courtesy of Wikipedia