A historical study traces the origins of periodic fairs from religious and pilgrimage gatherings into organized commercial institutions, examining their legal framework, administrative practices, and changing social roles. It surveys English regulation and case law including courts of piepowder and legislation, then follows the rise, development, and decline of two major English fairs across successive centuries. Comparable accounts treat notable continental fairs in France and the evolution of Russian fairs, especially the large Nijni-Novgorod gathering, and conclude with reflections on modern legislation and the persistence or decay of medieval fair forms.