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Jinwi-hyeon was a sub-hyeon(sub-county) of Suju and Pyeongtaek-hyeon was a sub-chyeon of Cheonan-bu in Goryo Era. Local families with surnames existed in the region but their power was not strong. When Taejo Wanggeon concilated the local family powers, he was interested in Chungju, Cheongju, and Jincheon as strategic areas. Taejo tried to incorporate the local power of Cheongju��s Yu family and Jincheon��s Im family from which Taejo��s 10th consort and Hyejong��s queen came. Cheongju area was also anti-cental government and Taejo Wanggeon tried to pacify the area by multiple visits and building walls, and he provided a preferential treatment to Chengju��s local power family.
Pyeongtaek area had a significance as a center from which Im family power settled first and migrated throughout the country. Pyeongtaek area a combinded area of Jinwi-hyeon of Gyeonggi province and Pyeongtaek-hyeon of Chungcheong province. Located at the western sea coast area, it had a geographical advantage of having a trade with China, and it provided the reason to have a tale that Im family ancestor came from China. Pyeongtaek-hyeon had agricultural fields of 2,234 gyeols(15,447�O) of which rice fields were three fifth, and Jinwi-hyeon had 2,841 gyeols of which rice fields was a half. According to Seo Geo Jeong, ��offcials and people of Jinwi-hyeon sufferd from frequest visits by envoys and official visitors as it was located at the juction of three provinces.�� Although Pyeongtaek was not a rich area this geographical factor contributed to the growth of Im family as one of nation��s big ten families.
Im family of Pyeongtaek spreaded out to Joyang, Okgu, Yecheon, Buan, Sunchang, Seonsan, Eunjin, and Gilan. The offsprings of Im family settled in the new areas and promoted themselves to central officials. There were various reasons for them to migrate to new areas. Mostly they migrated as they moved to the areas where their in-law families lived, or fleed from political oppression and wars. They might fleed to avoid explotation of local officials or collection of debts, or they might seek the ways to live at the time of bad harvest, though evidences are rare. This also happened to other families in general in Goryo Era.