Yang Xuangan
After the victories of Goguryeo over the Sui Dynasty, infighting occurred within the Goguryeo Court. The North faction, which was highly against the Sui, and the South faction, which favored peace with the Sui, fell into dispute over whether or not Goguryeo should take advantage of the Sui's preoccupation with the rebellion of Yang Xuangan. The North faction consisted of Yeon Taejo, Eulji Mundeok and the military officials, while the South faction consisted of Grand Prince Go Geon-Mu, and the scholar-officials. The South faction rose victorious, and Yeon Taejo attempted to pass his positions on to his eldest son Yeon Gaesomun, but was stopped by the other Daedaeros' protests. This resulted in Yeon Taejo's death without seeing a proper successor to his positions.