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In page Kisaeng:

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Other large concentrations existed around military camps, particularly along the northern border. For instance, in the time of Sejong the Great in the 15th century, there were some sixty kisaeng attached to the army base at Yongbyon.[7] In these areas, kisaeng essentially filled the role of wives for the army and their role was commensurately more focused on domestic tasks than entertainment.[citation needed]