淵蓋蘇文
Meanwhile, in Goguryeo, King Yeongnyu along with a number of courtiers planned to execute Yeon Gaesomun, one of the great nobles of Goguryeo, because he considered him a threat. However, the plot was foiled and Yeon Gaesomun killed the king along with opposing officials, and then made Yeongnyu's nephew Bojang the new King of Goguryeo. From that point, Yeon Gaesomun held de facto control of Goguryeo through his puppet King Bojang.