structural:reformatting, structural:scholar_edition
Involvement of other ethnicities

The Goguryeo kingdom was a powerful and influential state in northern Korea and parts of northeastern China at the beginning of the Sixteen Kingdoms period. Goguryeo was attacked by the Murong Xianbei numerous times, and in 342 Prince Murong Huang of Former Yan captured the Goguryeo capital Hwando (Wandu in Chinese). Under the powerful and dynamic leadership of feudal kings, Goguryeo during the reign of Gwanggaeto the Great successfully invaded the kingdoms of Baekje, Silla, and Dongbuyeo. Riding its success, Goguryeo campaigned against the Later Yan, obtaining the Liao River region. King Murong Xi of Later Yan twice launched retaliatory attacks to reclaim the Liao River watershed territory, but was only partially successful. At Northern Yan's destruction by the Northern Wei, Yan king Feng Hong fled to Goguryeo to seek asylum. Although granted asylum, Hong was said to have acted as if he was still king, issuing orders and demanding respect, and was executed by King Jangsu of Goguryeo.

The Yuwen Xianbei group Kumo Xi, who lived north of Youzhou, and the Khitan began increasing in strength. In 414, the Kumo Xi tribes sent a trade caravan to Northern Yan, then joined with the Khitan in declaring allegiance to Northern Yan, and then to Northern Wei after its destruction of Northern Yan. Thus, the Northern Wei (essentially the Tuoba Xianbei), held de facto rule over the entire Mongolian Plateau and the Liao River region.

In the Western Regions (modern Xinjiang) of the former Han Empire lay the kingdoms of Shanshan, Qiuzi, Yutian, Dongshi, and Shule. These kingdoms were often controlled or influenced by the various Liang kingdoms that existed during the Sixteen Kingdoms period. The Former Liang organized Gaochang Commandery (Chinese: 高昌郡) and Tiandi County (Chinese: 闐地縣) in the west, both under the administration of the Gaochang Governor. Day-to-day administration was run out of several forts: Western Regions Chief Clerk, Wu and Ji Colonel, and Jade Gate Commissioner of the Army. Other Liangzhou states generally followed this administrative system. In 382, the Former Qin ruler Fu Jian sent General Lü Guang on a military expedition to the Dayuan kingdom and promoted him to Protector General of the western border regions. After Qin collapsed and Lü Guang founded the Later Liang, the western border forts and the Shanshan kingdom all became parts of or vassals to the Later Liang.