Koguryo's royal family has a high surname and many versions. The Book of Jin contains "then the surname is Gao"; "The Heritage of the Three Kingdoms" records that "Ziyan is the son of the Emperor of Heaven, born in the sun, so his name is high"; Li Chengxiu's "Emperor Rhyme" contains the first birthday of the Li Dynasty, which is high in the country, so the surname is high.
Koguryo culture
Koguryo people live on agriculture, fishing and hunting, but the output of crops is not much, which makes people accustomed to dieting. Autumn Harvest Festival "ASEAN" is held in June+10 every year in 5438, offering sacrifices to the ancestors and cave gods of the country, during which people drink, sing and dance to celebrate. Koguryo society advocates thick burial, with stones as coffins, precious funerary objects such as gold and silver, and the outer layers are sealed many times to build stone tombs. In terms of marriage customs, Koguryo practices monogamy, allowing men and women to marry freely according to their own wishes, which is called "marriage, taking the pleasure of men and women, that is." After marriage, the man will live in the "husband's family" prepared by his husband's family. When the children grow up, the man can take his wife and children back to his mother's house. In addition, society allows younger brothers to marry widows and widows to remarry. Emperor Yan appeared three times on murals No.4 and No.5 of Koguryo's Tomb No.5 in Ji 'an City, Jilin Province, proving that Koguryo is also a descendant of Yanhuang.