Chapter 2 surveys extant theories of the nation and outlines the main positions in the historiographical debate. It begins with the primordial theories first posited by German Romantics, before turning to the “dominant orthodoxy,” modernism. It remains widely accepted that the nation is a distinctly modern type of community, the product of the profound intellectual and structural changes Western Europe underwent from the eighteenth through twentieth centuries. The chapter draws attention to the role of the state in modernist theories to explain why nations are generally defined as sovereign political communities. Medieval historians for their part have contested the modern dating of the emergence of nations and provided plentiful evidence for the existence of national communities prior to the sixteenth century. Even so, many scholars adhere to a political conception of the nation. The chapter highlights a tendency among medievalists to gauge the presence and cohesion of medieval nations principally by their degree of political institutionalization and discusses the anachronism of previous approaches to nationhood, thus illustrating the historiographical relevance of the study.