淵男生大莫離支
In 665, Yeon Namsaeng succeeded his father and became the 2nd of Goguryeo. After the death of his father, Yeon Namsaeng prepared for war with the Tang, and set out on an inspection of the border fortresses in Yodong, and other fortresses throughout the kingdom.
Yeon Namsaeng was said to have become sometime before the death of Yeon Gaesomun, who is said to have stepped down from the position and took the honorary position of Tae Namgeon and Namsan took advantage of their brother"s absence and took control of Pyeongyang and the Royal Courts. They falsely accused Namsaeng of being a traitor, and forced the King Bojang to order Namsaeng"s arrest. Namsaeng fled to the Tang, and received a high position in the Tang military.
From there he helped lead a Tang-sponsored military campaign into Goguryeo with hopes of regaining power.
This campaign ultimately destroyed Goguryeo in 668. He died in the domains of the Tang-established Protectorate General to Pacify the East, or Andong Duhufu (安東都護府), the Chinese administration established in Pyongyang following the fall of Goguryeo in 668 and meant to administer the former Goguryeo domains.
Namsaeng was buried on Mountain. Mang in Luoyang, Tang’s eastern capital.
Namsaeng"s biography (Quan Nan Sheng 泉男生傳) appears in the Xin Tangshu (New History of Tang), book 110.
