Oswald is Goneril’s steward—a functionary who embodies the moral rot at the heart of her household. Where Kent represents loyal service rooted in honor, Oswald represents its perversion: he serves not out of love or duty to his rightful master, but out of obsequious attachment to a mistress whose cruelty he enables and amplifies. He appears first as a minor irritant, refusing to acknowledge Lear’s authority and delivering his messages with deliberate coldness. When Lear strikes him and Kent trips him up in defense of the king’s dignity, Oswald’s resentment calcifies into active malice.
His true function emerges in Act 2, when Goneril explicitly instructs him to treat Lear’s knights with contempt and to report back on their behavior. Oswald becomes the agent through which her calculated campaign of humiliation proceeds. He carries letters between Goneril and Regan, and most significantly, he becomes the bearer of Goneril’s incriminating correspondence to Edmund—a letter that reveals her plot to murder Albany and marry Edmund, sealed with a kiss. This letter, found on his body after his death, becomes crucial evidence of the sisters’ treachery. Oswald is not intelligent enough to understand the full implications of what he carries; he is merely the conduit of evil, following orders without moral reflection. When he encounters Gloucester on the road to Dover and attempts to murder the blinded old man for the reward Regan has promised, he reveals the depths of his corruption.
Yet Oswald’s end is fitting: he is killed by Edgar, disguised as a peasant, who defeats him in single combat. In death, he remains useful to others—Edgar finds the letter on his body and uses it to expose the plot against Albany and Lear. Oswald never rises above the level of instrument; he has no interiority, no moment of self-recognition. He is the play’s portrait of servile obedience divorced from conscience, a man so devoted to his mistress’s will that he becomes complicit in murder, treason, and the torture of the helpless. His final words—begging Edgar to bury his body and deliver the letter to Edmund—contain no remorse, only continued service even in death. He is at once contemptible and pathetic, a warning about the moral danger of blind loyalty to the powerful.