Okjeo was a small tribal state which arose in the northern Korean peninsula from perhaps 2nd century BC to 5th century AD.
Dong-okjeo (East Okjeo) occupied roughly the area of the Hamgyŏng provinces of North Korea, and Buk-okjeo (North Okjeo) occupied the Duman River region. Buk-okjeo was also sometimes referred to as Chiguru (置溝婁, 치구루) or Guru (구루), the latter name being also applied to Goguryeo. Okjeo bordered the other minor state of Dongye on the south, and shared a similar fate.
In the 1st or 2nd century CE, King Taejo of Goguryeo reduced Okjeo to a tributary, which delivered local products to Goguryeo. During the 244 Wei Invasion of Goguryeo, Goguryeo’s King Dongcheon briefly retreated to North Okjeo, and in 285, the Buyeo court also temporarily escaped to Okjeo under northern nomadic attacks.
In early 5th century, Okjeo was completely conquered by Gwanggaeto the Great of Goguryeo.
Lee, K. (1984). A new history of korea. Tr. by E.W. Wagner & E.J. Schulz, based on the 1979 Korean ed. Seoul: Iljogak. ISBN 89-337-0204-0
Ancient peoples | Early Korean history | Former countries in Asia