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The relationship between Goryo and Later Chou(後周) has long been focused on its goods -trading and adaptation of the culture to strengthen the dynasty of Goryo. However both Goryo and Later Chou had always faced Khitan which was formidable enemy. Goryo and Later Chou inevitably shared the pressure of Khitan at all times. In other words, the relationship between Goryo and Later Chou cannot be explained without the consideration of national security. The threat of Khitan has pressured the alliance between Goryo and other countries that resided in the central China (near the Hwanghe river) Particularly during 959, the Shizong(世 宗) of Later Chou has passed away and Gongti(恭帝) was crowned however was quickly abdicated by Chao Kuang-yin(趙匡胤); and the new kingdom Song being created after the destruction of Later Chou. During 959-960, there had been numerous military conflicts between Later Chou and Khitan due to militant policy of Shi-zong. However after the death of Shi-zong, Later Chou had to worry about the strong militants of Khitan especially after the crowning of young emperor Gongti. This concern was preceded by previous attacks of Khitan and Northern Han(北漢) when young Shizong received his crown in the past. Later Chou wanted a powerful ally who can pose threat to Khitan from opposite side, and it has chosen Goryo. Later Chou had asked for military alliance with Goryo by sending the 3rd grade Imperator(左驍衛大將軍) Dai-jiao(戴交). Goryo invaded and occupied the land near Apnok River, and changed Kaekyung(開京) to the Emperor Capital(皇都), and began to use independent dynasty name Joon-Poong(峻豊) during the conflicts of Later Chou and Khitan․Khitan and Song. These military acts were caused by King Kwangjong(光宗) of Goryo to create a new empire independent of Khitan or China beside strengthen the imperial power within Goryo. In other words, Kwangjong did not stop to make cultural exchange with Later Chou but used the world order at the time to extend the Goryo territory and strengthen his imperial power, further creating the haven for Goryo.