Tuoba in the context of "Empress Zhangsun"

The Sixteen Kingdoms (simplified Chinese: 十六国; traditional Chinese: 十六國; pinyin: Shíliù Guó), less commonly the Sixteen States, was a chaotic period in Chinese history from AD 304 to 439 when northern China fragmented into a series of short-lived dynastic states. Most of these regimes were created by groups such as the Xiongnu, Xianbei, Di, Jie, and Qiang, who had moved into northern and western China over earlier centuries and rose in rebellion against the Western Jin dynasty in the early fourth century. Some states were founded by the Han as well. Regardless of their rulers' background, every state adopted dynastic institutions in the Han tradition and styled itself as a legitimate monarchy. These states often fought one another and also contended with the Eastern Jin dynasty, which governed the south after the collapse of Western Jin in 317. The era ended in 439, when Northern Wei, founded by the Tuoba clan of the Xianbei, reunified the north. The Eastern Jin dynasty had already collapsed in 420 and been replaced by the Liu Song dynasty, the first of the Southern Dynasties. After the consolidation of the north, Chinese history entered the period known as the Northern and Southern Dynasties.

The term "Sixteen Kingdoms" was first used by the 6th-century historian Cui Hong in the Spring and Autumn Annals of the Sixteen Kingdoms and refers to the five Liangs (Former, Later, Northern, Southern and Western), four Yans (Former, Later, Northern, and Southern), three Qins (Former, Later and Western), two Zhaos (Han/Former and Later), Cheng-Han and Xia. Cui Hong did not count several other kingdoms that appeared at the time including the Ran Wei, Zhai Wei, Chouchi, Duan Qi, Qiao Shu, Huan Chu, Tuyuhun and Western Yan. Nor did he include the Northern Wei and its predecessor Dai, because the Northern Wei is considered to be the first of the Northern Dynasties in the period that followed the Sixteen Kingdoms.

Wei (/weɪ/), known in historiography as the Western Wei (Chinese: 西魏; pinyin: Xī Wèi), was an imperial dynasty of China that followed the disintegration of the Northern Wei. One of the Northern dynasties during the era of the Northern and Southern dynasties, it ruled the western part of northern China from 535 to 557. As with the Northern Wei dynasty that preceded it, the ruling family of the Western Wei were members of the Tuoba clan of the Xianbei.

34°16′00″N 108°54′00″E / 34.2667°N 108.9000°E / 34.2667; 108.9000

Wei (/weɪ/), known in historiography as the Northern Wei (Chinese: 北魏; pinyin: Běi Wèi), Tuoba Wei (Chinese: 拓跋魏; pinyin: Tuòbá Wèi), Yuan Wei (Chinese: 元魏; pinyin: Yuán Wèi) and Later Wei (Chinese: 後魏; pinyin: Hòu Wèi), was an imperial dynasty of China ruled by the Tuoba (Tabgach) clan of the Xianbei. The first of the Northern dynasties, it ruled northern China from 386 to 535 during the period of the Northern and Southern dynasties. Described as "part of an era of political turbulence and intense social and cultural change", the Northern Wei dynasty is particularly noted for unifying northern China in 439, bringing an end to the chaotic Sixteen Kingdoms period, and strengthening imperial control over the rural landscape via reforms in 485. This was also a period of introduced foreign ideas, such as Buddhism, which became firmly established. The Northern Wei was referred to as "Plaited Barbarians" (索虜; suǒlǔ) by writers of the Southern dynasties, who considered themselves the true upholders of Chinese culture.

The Southern Liang (Chinese: 南涼; pinyin: Nán Liáng; 397–404, 408–414) was a dynastic state of China listed as one of the Sixteen Kingdoms in Chinese historiography. Members of the ruling Tufa clan were of Xianbei ethnicity and distant relatives of the Tuoba imperial house of the Northern Wei dynasty. According to the Book of Jin, the surname of the ruling house was changed from Tuoba to Tufa because one of the Tufa ancestors was born on a blanket, and in the Xianbei language, "Tufa" meant "blanket."

All rulers of the Southern Liang proclaimed themselves wang (king). The state was briefly discontinued in 404 after Tufa Rutan surrendered to the Later Qin, but restored in 408. As the state grew in power, the Tufa rulers also elevated their peerages before claiming the title of King of Liang in 402. It was hence only known as "Liang" (涼) from 402 to 404 and 408 to 414. They are given the prefix of "Southern" in historiography as they were based south of the other Liang states in northeastern Qinghai, although after occupying central Gansu, they briefly shifted the capital to the major city of Guzang (姑臧, in modern Wuwei, Gansu).

Dai, also rendered as Tai and sometimes known in historiography as the Tuoba Dai (Chinese: 拓跋代), was a dynastic state of China ruled by the Tuoba clan of Xianbei descent, during the era of Sixteen Kingdoms (although it is not listed as one of the 16). It existed from AD 310 to 376, with its capital at Shengle (near modern Horinger County of Hohhot, Inner Mongolia, China).

The name "Dai" originated when Tuoba Yilu was appointed the Duke of Dai (代公) by the Western Jin dynasty in 310, as a reward for helping Liu Kun, the Governor of Bingzhou (并州), fight against the Han-Zhao dynasty. The fief was later promoted from a duchy to a principality in 315. Dai was conquered in 376 by the Former Qin dynasty, and its descendants later established the Northern Wei dynasty in 386.