Dangun Wanggeom or Tangun was the legendary founder of Gojoseon, the first Korean kingdom, around present-day Liaoning, Manchuria, and the Korean Peninsula. He is said to be the "grandson of heaven", and to have founded the kingdom in 2333 BC. The earliest recorded version of the Dangun legend appears in the 13th-century Samguk Yusa, which cites China's Book of Wei and Korea's lost historical record Gogi (고기, ).