Abstract
Widespread, deep controversy as to the content of the law of a community is compatible with the view that the law is a system of rules. I defend that view through a critique of Ronald Dworkin's discussion of Riggs v. Palmer 22 N.E. 188. Dworkin raised an important challenge for jurisprudence: to account for the fact that legal rights and duties are frequently controversial. I offer an explanation of the possibility of deep disagreement about the application of social rules, which reconciles controversy as to the content of the law, with the model of a legal system as a system of rules. And I discuss the implications for understanding the role of judicial discretion in law