The rule of law, once widely embraced and emulated, now faces serious threats to its viability. To get our bearings we must return to first principles. Law’s Rule: The Nature, Value, and Viability of the Rule of Law articulates and defends a coherent, comprehensive, and compelling conception of the rule of law and defends it against serious challenges to its intelligibility, relevance, and normative force. In this lecture, Postema will sketch the basic outlines of this conception and the values it serves. The rule of law’s ambition, he will argue, is to provide protection and recourse against the arbitrary exercise of power using the distinctive tools of the law. Law provides a bulwark of protection, a bridle on the powerful, and a bond constituting and holding together the polity and giving public expression to an ideal mode of association. Two principles immediately follow from this core: sovereignty of law, demanding that those who exercise ruling power govern with law and that law governs them, and equality in the eyes of the law, demanding that law’s protection extend to all who are bound by it. Animating law’s rule, the ethos of fidelity commits all members of the political community to take responsibility for holding each other accountable under the law. The moral foundation of this demanding ideal lies in a commitment to common membership of each person in this community, recognizing their freedom, dignity, and status as peers. The lecture will consider the relationship between democracy, human rights, and the rule of law and will conclude with thoughts on some of the most serious threats to the viability of law’s rule.