This collection of essays on the rule of law focuses on the traditional question whether the rule of law is necessarily the rule of moral principles, the question of the legitimacy of law. Essays by lawyers, philosophers, and political theorists illuminate and take forward both that question and debate about issues to do with the reach of the rule of law which complicate its answer. The essays are divided into sections which deal, first, with legal orders where the rule of law is under severe stress, second, with the question of the value of the rule of law as a conceptual problem, and, third, with the question of the limits of legal order. Contributors: Richard Abel, Jody Freeman, Robert Alexy, Neil MacCormick, Kenneth Winston, Andras Sajo, Alon Harel, Anton Fagan, Anthony Sebok, Christine Sypnowich, Allan Hutchinson, Bill Scheuerman, John MacCormick, Julian Rivers, Henry Richardson, David Dyzenhaus.