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The Dongdan Kingdom was a local political power established by Emperor Taizu of the Liao Dynasty after he destroyed the Bohai Kingdom. It was a vassal state of the Liao Dynasty and was abolished 57 years after its founding. In the past, academic research on Dongdan Kingdom has always been relatively weak and unsystematic. Writing the history of Dongdan is a new attempt and a subject that has never been touched upon by previous scholars. This "History of Dongdan" is a pioneering work. The content of this book involves the politics, economy, culture, folk customs and important historical figures of Dongdan Kingdom. In terms of research on issues such as the name of the Dongdan Kingdom, the surnames of the noble families, the time when the citizens moved south, the official system, and the time when the Dongdan Kingdom was abolished, different views and perspectives were obtained from previous studies. In addition, the flow of nationals in Dongdan and related historical and geographical issues were discussed and verified.