Western Jin dynasty in the context of "Emperor Yuan of Jin"

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.

Jicheng, less commonly called Ji and Yanjing, was an ancient city in northern China, which has become the longest continuously inhabited section of modern Beijing. It has been known by numerous other names over its long history, usually in reference to the changing territories it presided over. Historical mention of Ji dates to the founding of the Zhou dynasty in about 1045 BC. Archaeological finds in southwestern Beijing where Ji was believed to be located date to the Spring and Autumn period (771–476 BC). The city of Ji served as the capital of the ancient states of Ji and Yan until the unification of China by the Qin dynasty in 221 BC. Thereafter, the city was a prefectural capital for Youzhou through the Han dynasty, Three Kingdoms, Western Jin dynasty, Sixteen Kingdoms, Northern Dynasties, and Sui dynasty. With the creation of a Ji Prefecture in present-day Tianjin during the Tang dynasty, the city of Ji became more exclusively referenced as Youzhou or by its subsequent renamings including Yanjing. Youzhou was one of the Sixteen Prefectures ceded to the Khitans during the Five Dynasties. The city then became the southern capital of the Liao dynasty and then the main capital of the Jurchen Jin dynasty. In the 13th century, Kublai Khan built a new capital city for the Yuan dynasty adjacent to Ji to the north. The old city of Ji became a suburb to Khanbaliq/Dadu, whose site was developed under the Ming and Qing dynasties into modern Beijing.

Liu Yuan (劉淵, died 29 August 310), courtesy name Yuanhai (元海), also known by his posthumous name as the Emperor Guangwen of Han (Zhao) (漢(趙)光文帝) was the founding emperor of the Xiongnu-led Han-Zhao dynasty of China during the Sixteen Kingdoms period. Due to Tang dynasty naming taboo, he is referred to by his courtesy name as Liu Yuanhai (劉元海) in the Book of Jin.

Liu Yuan was born into the aristocracy of the Five Divisions and was sent to the Chinese capital, Luoyang as a hostage during his youth, where he became highly sinicized and later held several government offices under the Western Jin dynasty. As the War of the Eight Princes weakened Jin authority in northern China, Liu Yuan was called upon by the Five Divisions to lead their rebellion, and in 304, he declared independence from the Jin and founded the Han-Zhao dynasty, one of the first of the Sixteen Kingdoms. His declaration, along with the founding of the Cheng-Han dynasty in Sichuan that same year, marked the formal end of the Western Jin's brief unification of China following the Three Kingdoms period.