Goguryeo
However, when it was under the control of 27th king, Youngryou (), Goguryeo was becoming a vassal of the Tang Dynasty. Because of this, the king was killed by Yoen Gaesomoon () and a new king, Bojang () succeeded. After Yoen Gaesomoon died, the people did not cooperate with the nation well and while its control got weak, it was destroyed by the allied forces of Tang and Silla.