In this major new study, Nicolas Tackett proposes that the Northern Song Dynasty (960-1127) witnessed both the maturation of an East Asian inter-state system and the emergence of a new worldview and sense of Chinese identity among educated elites. These developments together had sweeping repercussions for the course of Chinese history, while also demonstrating that there has existed in world history a viable alternative to the modern system of nation-states. Utilising a wide array of historical, literary, and archaeological sources, chapters focus on diplomatic sociability, cosmopolitan travel, military strategy, border demarcation, ethnic consciousness, and the cultural geography of Northeast Asia. In this ground breaking new approach to the history of the East Asian inter-state system, Tackett argues for a concrete example of a pre-modern nationalism, explores the development of this nationalism, and treats modern nationalism as just one iteration of a phenomenon with a much longer history.