We are told that the soil of Ko-gu-ryŭ was fertile and that the cereals grew abundantly. The land was famous for its fine horses and its red jade, its blue squirrel skins and its pearls. Chu-mong inclosed his capital in a heavy stockade and built store-houses and a prison. At its best the country stretched a thousand _li_ beyond the Yalu River and southward to the banks of the Han. It comprised the Nang-nang tribe from which Emperor Mu-je named the whole north-western portion of Korea when he divided northern Korea into four provinces. On the east was Ok-ju and on its north was Pu-yŭ. It contained two races of people, one living among the mountains and the other in the plains. It is said they had a five-fold origin. There were the So-ro-bu, Chŭl-lo-bu, Sun-no-bu, Kwan-no-bu and Kye-ro-bu. The kings at first came from the So-ro-bu line but afterwards from the Kye-ro-bu. This probably refers to certain family clans or parties which existed at the time of Chu-mong’s arrival and which were not discontinued. Chu-mong is said to have married the daughter of the king of Chŭl-bon and so he came into the control of affairs in a peaceful way and the institutions of society were not particularly disturbed. Agriculture was not extensively followed. In the matter of food they were very frugal. Their manners and customs were somewhat like those of Pu-yŭ but were not derived from that kingdom. Though licentious they were fond of clean clothes. At night both sexes gathered in a single apartment and immorality abounded. Adultery, however, if discovered, was severely punished. In bowing it was customary for these people to throw out one leg behind. While travelling, men more often ran than walked. The worship of spirits was universal. In the autumn there was a great religious festival. In the eastern part of the peninsula there was a famous cave called Su-sin where a great religious gathering occurred each autumn. Their religious rites included singing and drinking. At the same time captives were set free. They worshipped likewise on the eve of battle, slaughtering a bullock and examining the body for omens.