As internal struggles continued in Goguryeo,
Yŏn Namsaeng defected and 40 castles near the border surrendered to the Tang, while
Yŏn Chŏngto,
Yŏn Kaesomun's brother, defected to Silla. The Goguryeo capital fell to Silla-Tang forces in the ninth
lunar month of 668, and King Bojang was captured. He was appointed to the minister of public works (工部尚書) by
Tang Gaozong. Tang faced increasing problems ruling the former inhabitants of Goguryeo, as well as Silla's resistance to Tang's remaining presence on the Korean Peninsula. In 677, the Tang insisted on crowning Bojang as the "King of
Joseon" and put him in charge of the
Liaodong Commandery () of the
Protectorate General to Pacify the East. However, Bojang continued to foment rebellions against Tang in an attempt to revive Goguryeo, organizing Goguryeo refugees and allying with the
Malgal tribes. He was eventually banished to
Sichuan in 681, and died the following year. Because Bojang was the last ruler of Goguryeo, he did not receive a
temple name after his death. There was a brief attempt at Goguryeo restoration made by
Anseung, who ultimately surrendered to Silla. One of his sons
Ko Yak'gwang settled in Japan in 666 where he founded the
Koma clan and became known as Koma no Koshiki
Jakkō.
Ko Tŏngmu was a prince of
Goguryeo and founded
Lesser Goguryeo. He was the third son of King Bojang. ==Family==