Dangun
Dangun Wanggeom or Tangun was the legendary founder of Gojoseon, the first ever Korean kingdom, around present-day Liaoning, Manchuria, and the northern part of 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, 古記).
Mythology
Dangun's ancestry legend begins with his grandfather Hwanin (환인/桓因), the "Lord of Heaven". Hwanin had a son, Hwanung (환웅/桓雄), who yearned to live on the earth among the valleys and the mountains. Hwanin permitted Hwanung and 3,000 followers to descend onto Paektu Mountain, where Hwanung founded the Sinsi (신시/神市, "City of God"). Along with his ministers of clouds, rain and wind, he instituted laws and moral codes and taught humans various arts, medicine, and agriculture. Legend attributes the development of acupuncture and moxibustion to Dangun.