Feng Hong
The Xia under Helian Ding moved to Pingliang, Gansu and conquered the Western Qin at Jincheng (modern day Lanzhou) in 431. Helian Ding sought an alliance with the Liu Song dynasty but was driven further west by the Northern Wei. Helian Ding wanted to invade the Northern Liang but was captured in a raid by the Tuyuhun nomads and executed by the Northern Wei. In 436, the Tuoba Tao, as Emperor Taiwu, led an expedition against the Northern Yan. Feng Hong, the younger brother of Feng Ba, fled to Goguryeo, where he was killed. The last ruler of the Northern Liang, Juqu Mujian, surrendered in 439, completing the Northern Wei's unification of northern China and marking the end of the Sixteen Kingdoms period. The Tuobas were eventually Sinicized, changing their name to Yuan, and held northern China through the 550s.