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Abstract

As the territory of the Goryeo Dynasty, the 'Jikhalryeong' (which means the territory of direct control of a country and union) of Yuan Dynasty were Ssanseongchonggwanbu and Dongnyeongbu. These were important areas to defend the Gaegyeong as the region of Northeast Yanggae. And having been made them to the Jikhalryeong of Yuan Dynasty could weaken mainland grip of the Goryeo Dynasty. Since the Goryeo Dynasty was persistent, it demands the return of these areas. As a result, while Dongnyeongbu that were returned in 20 years, Ssanseongchonggwanbu was maintained until 1356 when it was recaptured directly. The installation of Ssanseongchonggwanbu was done when Johwi and TakCheong was surrendered to the Mongol in the December 1258. During this period, the Military Rule was destroyed by removing Choiui of Yoogyeong and Kiminjun, and this situation has been the opportunity of a large-scale invasion of the Mongol. Mongolia pressures put a weight on the Gangdo government. Because of this reason, King and the Military Rule had no choice to accept the demands of Mongolia. It was more pressure this situation that was the surrender of Johwi and Takcheong. Dongnyeongbu was established when it was surrendered to the Mongol by Choitan and Hanshin in October 1269. During this period, Imyeon deposed king Wonjong, which was heightened the tension with Mongol. So it was applying that the resistance of Choitan etc in Bukgye was a great blow to the regime of Imyeon, king Wonjong and Mongol have been a good opportunity to pressure the Military Rule. However, in Mongol it did not make this region as soon as Dongnyeongbu, at first it was managed by Haengjungseoseong of Mongol. Installation of Ssanseongchonggwanbu and Dongnyeongbu was quite as crisis situations to the king Wonjong and the Military Rule. In particular, there was direct mention of Mongolia on the border in Dongnyeongbu installation process, it was compared with Ssanseongchonggwanbu installation process. In addition, it can be seen that was much more effort for the return of Dongnyeongbu than Ssanseongchonggwanbu first installed in the Goryeo Dynasty. This issue of the return process can be said that would be appreciated the territory consciousness of the Goryeo Dynasty. Eventually, Ssanseongchonggwanbu and Dongnyeongbu were the loss of territory to be done from the failure of struggle with Mongolia, after returning problem of these two regions was directly related to the phase of the Goryeo Dynasty in the Yuan Dynasty. The return of Dongnyeongbu has been made when more close of the Goryeo Dynasty and Yuan Dynasty happened. The recapture of Ssanseongchonggwanbu was a result of anti-Mongolia. Since these two regions was also an important issue connected with northern border.