The Wei shu tells people that 2,000 years ago, when the wise Emperor Yao ruled China, Tan'gun Wanggom chose Asadal as his capital and founded the country of Choson. The Old Record notes that in olden times Hwan'in's stepson, Hwan'ung, wished to descend from heaven and live in the world of man. Guessing his son's desire, Hwan'in surveyed the three highest mountains and found Mount T'aebaek the most suitable place for his son to settle to help mankind. Therefore he gave Hwan'ung three heavenly seals and allowed him to rule over the people. Hwan'ung descended with 3,000 followers to a spot under a sandalwood tree atop Mount T'aebaek, and he called this place the City of God. Leading the Earl of Wind, the Master of Rain, and the Master of Clouds, he took charge of some 360 areas of responsibility, including agriculture, allotted lifespans, illness, punishment, and good and evil, and he brought culture to his people.