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The tributary relationship that Sui and Tang dynasties demanded of Goguryeo, was of a different nature from previous practices. As unified dynasties in Middle China they tried to wield absolute power over the surrounding states. They formally demanded Goguryeo to become a tributary state in fact. When Goguryeo refused this demand, the two dynasties constantly attempted to subdue Goguryeo by use of force to realize a Sino-centric order in the Middle Kingdom. This is the background of the series of conflicts between Goguryeo and the Sui and Tang dynasties.
Chinese scholars argue that Goguryeo was a provincial regime of various dynasties in "Middle China," and try to incorporate the history of Goguryeo into that of China. Their rational is based on the tributary relationship between the Chinese dynasties and Goguryeo at the time in which Goguryeo paid tributes and received investitures from the Chinese dynasties. |