Ugeo (Korean: 위우거; Hanja: 衛右渠, died 108 BC) was the last king of Wiman Joseon, the last remnant of Gojoseon.
Ugeo was killed by an assassin sent by a faction advocating surrender.
Around the period from 128 BC to 126 BC, Canghai Commandery, covering an area in northern Korean peninsula to southern Manchuria, existed.
Nan Lü (Hanja:南閭), who was a monarch of Dongye and a subject of Wiman Joseon, revolted against Ugeo of Gojoseon and then surrendered to the Han dynasty with 280,000 people.
[a] The Canghai Commandery was established following this revolution, however in 2 years, it was abolished by Gongsun Hong.