Final answer:
The epithet most commonly applied to Iago in Shakespeare's Othello is "Honest," which is ironic given his deceitful character.
Step-by-step explanation:
The epithet most commonly applied to Iago throughout the play Othello by William Shakespeare is Option 1: Honest. This is deeply ironic, as Iago is far from honest; he is manipulative, duplicitous, and betrays others. However, other characters in the play refer to Iago as 'honest Iago', demonstrating their trust in him and his ability to deceive those around him. This phrase is used repeatedly, highlighting the dramatic irony of Iago's perceived trustworthiness compared to his actual scheming nature.