Sixteen Kingdoms in the context of "Emperor Hui of Jin"

The Xiongnu (Chinese: 匈奴, [ɕjʊ́ŋ.nǔ]) were a tribal confederation of nomadic peoples who, according to ancient Chinese sources, inhabited the eastern Eurasian Steppe from the 3rd century BC to the late 1st century AD. Modu Chanyu, the supreme leader after 209 BC, founded the Xiongnu Empire.

After overthrowing their previous overlords, the Yuezhi, the Xiongnu became the dominant power on the steppes of East Asia, centred on the Mongolian Plateau. The Xiongnu were also active in areas now part of Siberia, Inner Mongolia, Gansu and Xinjiang. Their relations with the Chinese dynasties to the south-east were complex—alternating between various periods of peace, war, and subjugation. Ultimately, the Xiongnu were defeated by the Han dynasty in a centuries-long conflict, which led to the confederation splitting in two, and forcible resettlement of large numbers of Xiongnu within Han borders. During the Sixteen Kingdoms era, listed as one of the "Five Barbarians", their descendants founded the dynastic states of Han-Zhao, Northern Liang and Helian Xia and during the Northern and Southern dynasties founded Northern Zhou (founded by members of the Yuwen tribe of Xiongnu origin) in northern China.

The Xianbei (/ʃjɛnˈbeɪ/; simplified Chinese: 鲜卑; traditional Chinese: 鮮卑; pinyin: Xiānbēi) were an ancient nomadic people that once resided in the eastern Eurasian steppes in what is today Mongolia, Inner Mongolia, and Northeastern China. The Xianbei were likely not of a single ethnicity, but rather a multilingual, multi-ethnic confederation consisting of mainly Proto-Mongols (who spoke either pre-Proto-Mongolic, or Para-Mongolic languages), and, to a minor degree, Tungusic and Turkic peoples. They originated from the Donghu people who splintered into the Wuhuan and Xianbei when they were defeated by the Xiongnu at the end of the third century BC. Following the split, the Xianbei people did not have direct contact with the Han dynasty, residing to the north of the Wuhuan. In the first century BC, the Xianbei began actively engaging in the struggle between the Han and Xiongnu, culminating in the Xianbei replacing the Xiongnu on the Mongolian Plateau.

In the mid-2nd century, the chieftain, Tanshihuai unified the Xianbei and waged war against the Han dynasty. His confederation threatened the Han's northern borders for many years, but quickly disintegrated following his death in 181 AD. After suffering several defeats by the end of the Three Kingdoms period, the Xianbei migrated southwards and settled in close proximity to Han society, submitting as vassals to the Chinese dynasties. As one of the so-called "Five Barbarians", they fought as auxiliaries for the Western Jin dynasty during the War of the Eight Princes and the Upheaval of the Five Barbarians before eventually distancing themselves and declaring their autonomy while the Jin were pushed out from northern China. During the Sixteen Kingdoms period, the Xianbei founded several short-lived states and established themselves on the Central Plains.

The Five Barbarians, or Wu Hu (Chinese: 五胡; pinyin: Wǔ Hú), is a Chinese historical exonym for five ancient non-Han "Hu" peoples who immigrated to northern China in the Eastern Han dynasty, and then overthrew the Western Jin dynasty and established their own kingdoms in the 4th–5th centuries. The peoples categorized as the Five Barbarians were:

• Xiongnu
• Jie
• Xianbei
• Qiang
• Di

Of these five tribal ethnic groups, the Xiongnu and Xianbei were nomadic peoples from the northern steppes. The ethnic identity of the Xiongnu is uncertain, but the Xianbei appear to have been Mongolic. The Jie, another pastoral people, may have been a branch of the Xiongnu, who may have been Yeniseian or Iranian. The Di and Qiang were from the highlands of western China. The Qiang were predominantly herdsmen and spoke Sino-Tibetan (Tibeto-Burman) languages, while the Di were farmers who may have spoken a Sino-Tibetan or Turkic language.

The Han-Zhao (simplified Chinese: 汉赵; traditional Chinese: 漢趙; pinyin: Hàn Zhào; 304–329 AD), or Former Zhao (simplified Chinese: 前赵; traditional Chinese: 前趙; pinyin: Qián Zhào), was a dynastic state of China ruled by the Liu (Luandi) clan of Chuge-Xiongnu ethnicity during the Sixteen Kingdoms period of Chinese history. In Chinese historiography, it was given two conditional state titles, the Northern Han (北漢; Běi Hàn) for the state proclaimed in 304 by Liu Yuan, and the Former Zhao (前趙; Qián Zhào) for the state proclaimed in 319 by Liu Yao. The reference to them as separate states can be misleading, given that when Liu Yao changed the name of the state from "Han" to "Zhao" in 319, he treated the state as having been continuous from when Liu Yuan founded it in 304; instead, he de-established his imperial lineage from the Han dynasty and claimed ancestry directly from Modu Chanyu.

The reason it is also referred to as "Former Zhao" in historiography is to distinguish it from the Later Zhao founded by Shi Le in 319, which was also known officially as "Zhao". Since both the Former Zhao and Northern Han were ruled by the same family, Chinese scholars often conditionally combined them into a single Han-Zhao regime. Numerous Western texts refer to the two states separately; others referred to the Han state as the "Northern Han" (not to be confused with Northern Han of the Five Dynasties and Ten Kingdoms period).

The Northern Liang (Chinese: 北涼; pinyin: Běi Liáng; 397–439) was a dynastic state of China and one of the Sixteen Kingdoms in Chinese history. It was ruled by the Juqu (沮渠) family of Lushuihu ethnicity, though they are sometimes categorized as Xiongnu in some historiographies. Although Duan Ye of Han ethnicity was initially enthroned as the Northern Liang ruler with support from the Juqu clan, Duan was subsequently overthrown in 401 and Juqu Mengxun was proclaimed monarch.

All rulers of the Northern Liang proclaimed themselves "wang" (translatable as either "prince" or "king"). It was also only known as "Liang" (涼) from 399 to 401 and from 431 to 433, as their rulers took on several lesser titles while they were acting as vassals. To distinguish with the other Liang states, they were given the prefix of "Northern" by historiographers as they controlled northern Gansu when they first established. They later went on to rule the entirety of the Hexi Corridor with the key city of Guzang (姑臧, in modern Wuwei, Gansu) as their capital.

Xia (Chinese: 夏; pinyin: Xià), known in historiography as Hu Xia (胡夏), Xiongnu Xia (匈奴夏), Helian Xia (赫連夏) or the Great Xia (大夏), was a dynastic state of China ruled by the Helian clan of Tiefu-Xiongnu ethnicity during the Sixteen Kingdoms period. Prior to establishing the Xia, the imperial clan existed as a tribal entity known as the Tiefu (simplified Chinese: 铁弗; traditional Chinese: 鐵弗; pinyin: Tiěfú).

All rulers of the Xia declared themselves "emperors". Both the Tiefu and Xia were based in the Ordos Desert, and during the reign of Helian Bobo, they constructed their capital of Tongwan, a heavily fortified and state-of-the-art city that served as a frontier garrison until the Song dynasty. Its ruins were discovered during the Qing dynasty and can still be seen in present-day Northern Shaanxi. At its peak, the Xia also controlled the Guanzhong region in modern-day central Shaanxi. Due to being a mix of the Xiongnu and Xianbei ethnicities, the Tiefu were initially known as a group of Wuhuan, which in the 4th century, was another term for "miscellaneous hu" or "zahu" (雜胡). It was not until Helian Bobo came to power that they fully affirm their Xiongnu lineage in a bid for legitimacy by claiming descent from the ancient Xia dynasty.

The Northern and Southern dynasties (Chinese: 南北朝; pinyin: Nán běi cháo) was a period of political division in the history of China that lasted from 420 to 589, following the tumultuous era of the Sixteen Kingdoms and the Eastern Jin dynasty. It is sometimes considered to be the latter part of a longer period known as the Six Dynasties (220–589). The period featured civil war and political chaos. However, it was also a time of flourishing arts and culture, advancement in technology, and the spread of Mahayana Buddhism and Taoism. The period saw large-scale migration of Han Chinese people to lands south of the Yangtze. It came to an end with the unification of China proper by Emperor Wen of the Sui dynasty in 589.

During this period, the process of sinicization accelerated among the non-Han ethnicities in the north and the indigenous peoples in the south. This process was also accompanied by the increasing popularity of Buddhism in both northern and southern China. Daoism gained influence as well, with two essential Daoist canons written during this period. Additionally, many notable technological advances occurred during this period. The invention of the stirrup during the earlier Jin dynasty (266–420) helped spur the development of heavy cavalry as a combat standard. Historians also note advances in medicine, astronomy, mathematics, and cartography. Intellectuals of the period include the mathematician and astronomer Zu Chongzhi (429–500), and astronomer Tao Hongjing (456–536).

The Yuwen (Chinese: 宇文; pinyin: Yǔwén < Eastern Han Chinese: *wa-mun < Old Chinese *waʔ-mən) is a Chinese compound surname which originated from a pre-state clan of Xianbei ethnicity of Xiongnu origin during the era of Sixteen Kingdoms in China, until its destruction by Former Yan's prince Murong Huang in 345. Among the eastern Xianbei clans that ranged from the central part of the present day Liaoning province and eastward, Yuwen clan was the largest, and was awarded the position of the leader of eastern Xianbei (東部大人) by Chinese rulers. A descendant of the Yuwen tribe, Yuwen Tai, established the Northern Zhou dynasty in the 6th century.

Yuwen were descendants of the nomadic Xiongnu who assimilated into the Xianbei after 89 CE and ruled the Kumo Xi and Khitan (both Mongolic peoples) before being defeated by Murong Huang in 344, upon which Yuwen separated from the Kumo Xi and Khitan. The language of the Yuwen is thought to be Turkic or a very distant branch of Mongolic.