Gija Joseon
According to the mythic account recounted in the "Samguk yusa" (1280s), the Gojoseon (Old Joseon) kingdom was founded in northern Korea and southern Manchuria in 2333 BC. In the 12th century BC Gija, a prince from the Shang dynasty of China, purportedly founded Gija Joseon. The first written historical record on Gojoseon can be found from the early 7th century BC. The Jin state was formed in southern Korea by the 3rd century BC. In the 2nd century BC, Gija Joseon was replaced by Wiman Joseon, which fell to the Han dynasty of China near the end of the century. This resulted in the fall of Gojoseon and led to succeeding warring states, the Proto–Three Kingdoms period that spanned the later Iron Age.