Final answer:
In Shakespeare's 'Othello', the character Iago is often referred to ironically as 'Honest Iago', despite his deceitful actions throughout the play.
Step-by-step explanation:
The epithet most commonly applied to Iago throughout Shakespeare's play, Othello, is Honest. Despite Iago being manipulative and deceitful, other characters frequently refer to him as 'honest Iago'. This is used ironically, as Iago is anything but honest, manipulating the other characters and orchestrating the downfall of Othello.