Goguryeo or Koguryo (Hangul: 고구려; Hanja: 高句麗; Korean pronunciation: [ko.ɡu.ɾjʌ]) (37 BC ~ 668 AD) was one of the ancient Three Kingdoms of Korea, located in present-day northern and central parts of the Korean Peninsula, southern Manchuria, and southern reaches of Russia’s Primorsky Krai. Goguryeo was an active participant in the power struggle for control of the Korean peninsula and was also associated with the foreign affairs of neighboring polities in China and Japan.
The Samguk Sagi, a 12th-century Goryeo text, indicates that Goguryeo was founded in 37 BC by Jumong, a prince from Buyeo, although there is archaeological and textual evidence from Chinese geographic monographs that suggests that Goguryeo may have been in existence since the 2nd century BC around the fall of Gojoseon, an earlier kingdom which also occupied southern Manchuria and northern Korea.
Goguryeo was a major dynasty in Northeast Asia, until it was defeated by a Silla-Tang alliance in 668 AD. After its fall, its territory was divided among Unified Silla, Balhae, and the Tang dynasty.
The shortened name for Goguryeo was adopted by the Goryeo dynasty (A.D. 918-1392), whose territory was in the southern portion of Goguryeo, and would be the foundation of the English word “Korea.”