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Background

Wang Kŏn was born in 877 to a powerful maritime merchant family of Goguryeo descent based in Songak (modern Kaesong) as the eldest son of Wang Ryung. According to the Pyeonnyeon tongnok (편년통록; 編年通錄), quoted in the Goryeosa, Wang Kŏn's grandfather Chakchegon was the son of Emperor Suzong of Tang. According to the Encyclopedia of Korean Culture and the Doosan Encyclopedia, this is hagiographical. The Pyeonnyeon tongnok (c. late 12th century) said: While on a sea voyage to meet his father, Emperor Suzong of the Tang dynasty, 16-year-old Chakchegon encountered a dragon king, slayed a shape-shifting fox, and married a dragon woman; the dragon woman later transformed into a dragon and went away. According to the Seongwollok (성원록; 聖源錄), quoted in the Goryeosa, the "dragon woman" was a daughter of Tu Ŭn-chŏm from Pyongju (modern-day Pyongsan County). The story that Wang Kŏn was descended from either Suzong or Xuanzong was dismissed by the Joseon compilers of the Goryeosa. Modern historians believe that Wang Kŏn's ancestors were influential Goguryeoic hojoks (lords) that conducted maritime trade with China for generations. According to the Gaoli tujing (c. early 12th century) written by the Song dynasty envoy Xu Jing, Wang Kŏn's ancestors were Goguryeo nobility. According to Jang Deokho, his ancestors were Goguryeo refugees who settled around Songak, accumulating great wealth through maritime trade and gaining control of the region, including the Ryesong River. During the Later Silla period, the northern regions, including Songak, were the strongholds of Goguryeo refugees, and Wang Kŏn's hometown of Songak would become the original capital of Later Goguryeo in 901.

According to a document created during the reign of King Uijong of Goryeo, the Sillan monk Doseon prophesied that Wang Kŏn would rise to power and become king after visiting Wang Kŏn's father.