He Knew He Was Right is an 1869 novel written by Anthony Trollope which describes the failure of a marriage caused by the unreasonable jealousy of a husband exacerbated by the stubbornness of a willful wife. As is common with Trollope's works, there are also several substantial subplots. Trollope makes constant allusions to Shakespeare's Othello throughout the novel. Trollope considered this work to be a failure; he viewed the main character as unsympathetic, and the secondary characters and plots as much more lively and interesting, but it is one of his best-known novels.