Begins with the textual crux–Q’s “you” and F’s “he”–in Iago’s question to Othello at III, iii, 96-7: “Did Michael Cassio/When [someone] woo’d my Lady, know of your love?” Q’s reading is unanimously but silently adopted by all modern editors of the play, who take F as their copy text, on the assumption that F’s reading makes no sense. Continues with a discussion of the role of intermediaries in courtly love, in other instances in Shakespeare, and in the case of “Othello.” Shows that Iago’s insinuation as a fact of Cassio’s courtship the more specific and stronger prompt to Othello’s jealousy. Explains Othello’s jealousy in terms of his transformed perception of Cassio’s role in his courtship of Desdemona and its altered meaning for him of his chivalric accomplishments, his honor, and her affections. Concludes by showing that F’s reading made sense to Shakespeare, his company, and his audience; and, if F is taken as copy text, editors have no reason to emend it with Q.