Shakespeare's plays are best studied in clusters if we want to understand the political thought and preoccupations which inform their action rather than, as has been more usual practice, their generic identity. Plays written around the time of the Gunpowder Plot (1605) and the subsequent imposition of the Oath of Allegiance share common concerns regarding the swearing of oaths, honest speech, trustworthiness, and loyalty—issues that transcend distinctions between tragedies, comedies, histories and Roman Plays. I explore the relationship between political language and ideas in Coriolanus and All's Well That Ends Well, plays that are rarely analyzed together yet which use similar language, represent related issues, and address similar anxieties. Both are part of a larger group—including Othello and Macbeth—which engage a contemporary audience of London citizens, representing the difficulty of life in times of acute paranoia.