Goguryeo
The legend of the nation's birth is that Jumong was born out of an egg and brought up by King Gumwa () of East Buyeo. The name, Jumong, means a person who is good at archery. Because of his archery skills, Prince Daeso () envied him. So, Jumong felt death threats and decided to escape from East Buyeo with three friends. He went to Jolbon Buyeo and married Sosuno () who was the princess of the nation. Jumong succeeded the king and changed the nation's name to Goguryeo after his surname.