• (The)Study of the Eastern Classic
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• no.73
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• pp.91-117
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• 2018

In the tribute system controlling international relations of pre-modern East Asia, conciliation diplomacy between royal authorities was a principle of diplomatic relations among each nation. Therefore, capitals where royal authorities really existed were political centers and diplomatic stages at the same time. Notably, diplomatic relations between United Silla and Japan were maintained dually by conciliation diplomacy between royal authorities and practical diplomacy through Dazaihu located in Tsukushi. Tsukushi located at the northwestern tip of Kyushu was a gateway to foreign nations and stronghold in terms of national defense. Amidst an East Asian war named Baek River Battle in 663, the royal court of Daehwa established Dazaihu here because it was necessary for diplomatic and military responses. Dazaihu established as part of diplomatic negotiation not only took diplomatic functions as an official residence since the latter half of the 7thcentury. and but also was used as a stage of official diplomacy between Silla and Japan. Diplomatic negotiation between Silla and Japan through Dazaihu was made in practical methods and such a situation could be confirmed through diplomatic documents exchanged between Silla and Dazaihu in the middle of the 8thcentury. At that time, protocols became an importan tissue.