Proper noun
Gojoseon
An ancient Korean kingdom.
After many conflicts with the Chinese Han dynasty, Gojoseon disintegrated, leading to the Proto–Three Kingdoms of Korea period. Source: Internet
Nevertheless, Pyongyang became a major city under Gojoseon. Source: Internet
Some scholars maintain that the term Dangun also refers to a title used by all rulers of Gojoseon, and that Wanggeom is the proper name of the founder. Source: Internet
The new official name has its origin in the ancient country of Gojoseon (Old Joseon). Source: Internet