[1][2][3][4] As a descendant of Hae Mo-su, Chumong was driven by the goal of reuniting all of Gojoseon's ancient territory into one whole empire and one whole nation.
According to the Samguk sagi, the Goguryeo royal family claimed descent from the mythical god Gao Yang, who was the grandson of the Yellow Emperor of Chinese mythology, and thus took the surname of "Ko" (高);[5][6][7][8] however, this legend was discredited in the commentaries (논찬; 論贊) by Kim Pu-sik, the compiler of the Samguk sagi, who concluded that both Baekje and Goguryeo originated from Buyeo.
Gwanggaeto the Great attacked and conquered Buyeo, Biryu-guk, the Later Yan, Malgal, and the Ainu tribes.
King Munjamyeong continued to expand Goguryeo's territories after receiving the full surrender of the ancient Korean state of Buyeo in 494.
King Yeongryu was assassinated by Yeon Gaesomun, who was Dae Magniji (대막리지/Grand Prime Minister) of Goguryeo until 666 CE.
[10] Ansŭng settled down in Kŭmma-chŏ (modern-day Iksan, South Korea) and was enfeoffed as the King of Bodeok, a Silla vassal state, in 674.