Social Norms in the Courts of Ancient Athens Adriaan Lanni Journal of Legal Analysis, Vol.1:2 (2009) Abstract Ancient Athens was a remarkably peaceful and well-ordered society by both an- cient and contemporary standards. Scholars typically attribute Athens’ success to internalized norms and purely informal enforcement mechanisms. This article ar- gues that the formal Athenian court system played a vital role in maintaining order by enforcing informal norms. This peculiar approach to norm enforcement com- pensated for apparent weaknesses in the state system of coercion. It mitigated the effects of under-enforcement in a private prosecution system by encouraging litigants to uncover and punish their opponents’ past violations. Court enforcement of extra-statutory norms also permitted the Athenians to enforce a variety of social norms while maintaining the fictions of voluntary devotion to military and public service and of limited state interference in private conduct. Informal norms have lately been celebrated as an important adjunct to formal law in regulating behavior. There is a rich academic literature examining the relationship between social norms and informal sanctions (such as gossip or private dispute resolution) on the one hand, and formal legal rules and institutions on the other. Scholars have explored these issues in various social settings: the international diamond trade, the cotton industry, the Tokyo tuna market, the champagne fairs of the early Middle Ages, cattle ranching in California, and the world of Japanese sumo wrestling. Each of these studies attempts to delineate one approach to the enforcement of norms, and to explore how and how well this arrangement operated within its social context. This article aims to add ancient Athens to the list. The Athenian case is particularly interesting for two reasons. While much of the norms literature focuses on the choice between informal and formal norms and institutions, in Athens informal norms were enforced through the formal court system. As we will see, the formal enforcement of putatively informal norms had a number of interesting consequences, such as veiling some of the highly coercive aspects of Athenian society.