The introduction sets up the main arguments and problems of the book. It opens with three short case studies, through which we are introduced to the kinds of people who will be encountered in the book. It gradually builds up the complex picture of legal pluralism in late-medieval England, and draws this together with the broader problems facing the historiography of law and society, namely, the problem of differentiating ‘the legal’ from ‘the social’ in a model where they are mutually constitutive. It goes on to suggest two frameworks for doing this: first, through the concept of ‘local legal cultures’, as the distinctive senses of law produced within constellations of local environments, socio-economic patterns, and legal institutions; and second, through the notion of ‘common legalities’, widespread practices through which ordinary people differentiated law from the social, both inside and outside of legal institutions. Finally, it explains the extent and range of local sources used to ground the book’s arguments, and the methodology employed in reading them as texts.