Mongol’s intervention in the succession process of the throne of the nearby states was actually an act of officially “installing” kings and lords in those perimeter states. It was performed as a formality within East Asian international relations, but was also based upon Mongol traditions. This paper has shown that Mongol intervention in the succession of the Koryŏ throne was one of those examples. How it changed the dynamics inside Koryŏ is observed in this article. As the relationship with the Mongol emperor as well as the imperial family became more and more important to the Koryŏ king’s royal authority and the succession of the Koryŏ throne which would only be completed by the aforementioned “installation” process, traditional blood ties within the Koryŏ family becomes less and less crucial. The Koryŏ T’eja figure used to obtain the throne and ensure the stability of its own royal authority based on traditional blood ties, but in this period the T’eja seat itself lost its prior political and meaning, and the kešig system replaced its functions. These changes also affected the Koryŏ king’s royal authority, and the existing Koryŏ hierarchy based on blood relations was severely distorted. The political center (of Koryŏ) itself was shattered, and then created was a structure where the king was unable to control other power subjects. The king was no longer at the top of that hierarchy. The emperor was. In sum, in order to adequately observe this time period, we need to consider that the relationship formed between Koryŏ and the empire was a result of Mongol’s own relationship-forming method. We should be aware that Mongol Empire’s blatant intervention in the Koryŏ throne succession process was neither impulsive nor random, but only occurred as a systemically determined decision. What should be noted is that this caused the literal “relativization” of the Koryŏ royal authority, which directly affected the status of the Koryŏ king and his vassals, meaning of concepts and systems concerning the Koryŏ throne itself, and the relationship between political powers, in an irrevocable fashion.
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