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History
According to Samguk Sagi, King Jumong (posthumously called King Dongmyeongseong) founded the kingdom in 37 BC around what is now the border between China and North Korea. It gained power while China was fragmented. The maximum extent of the kingdom was reached during the reigns of King Gwanggaeto the Great and his son King Jangsu. During this period they ruled half of Korean peninsula and most of Manchuria. It was overthrown by an alliance of Silla and Chinese Tang Empire in 668. The southernmost part of Goguryeo was seized by Silla, the northwestern part was by Tang, and the rest was succeeded by Balhae (Chinese: Bohai).
Balhae, established in 698 claimed it as successor of Goguryeo in her diplomatic negotiations with Japan. Taebong, initially called Hu-Goguryeo ("Later Goguryeo"), claimed her succession of Goguryeo and so did Goryeo, which was even named after Goguryeo.
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Issues | 
About Goguryo | 
China's Policy | 
Korea's Position
