Southern Liang (Sixteen Kingdoms) in the context of "Helian Bobo"

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 The Eastern Jin dynasty had already collapsed in 420 and been replaced by the Liu Song dynasty, the first of the Southern Dynasties.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.

The Former Liang (Chinese: 前涼; pinyin: Qián Liáng; 301–376) was a dynastic state, and one of the Sixteen Kingdoms, in Chinese history. It was founded by Zhang Shi of the Han Chinese Zhang family. Its territories included present-day Gansu and parts of Ningxia, Shaanxi, Qinghai and Xinjiang.

All rulers of the Former Liang remained largely titularly under the court of the Eastern Jin dynasty as the Duke of Xiping except Zhang Zuo who proclaimed himself emperor (or king). However, at times the other Former Liang rulers also used the king title when imposed on them when they were forced to submit to their powerful neighbour states—initially the Former Zhao, then the Later Zhao, and finally the Former Qin. As the early rulers did not explicitly declare their independence, the official year of Former Liang's establishment is up to interpretation, but no earlier than 301, the year when Zhang Gui was appointed Inspector of Liang province. Historiographers gave the state the prefix of "Former" to distinguish it from the Di-led Later Liang that came after them, along with the other Liang states of the Sixteen Kingdoms, Southern Liang, Northern Liang and Western Liang.

The Later Liang (simplified Chinese: 后凉; traditional Chinese: 後凉; pinyin: Hòu Liáng; 386–403) was a dynastic state of China and one of the Sixteen Kingdoms in Chinese history. It was founded by the Lü family of the Di ethnicity and given the prefix of "Later" in historiography to distinguish it with the Former Liang dynasty before them and the three Liang states (Southern, Northern and Western) that emerged during their collapse.

All rulers of the Later Liang proclaimed themselves "Heavenly King" (Tian Wang). The state's founder, Lü Guang initially took on lesser titles before declaring himself Heavenly King of Liang in 396, and so the state was only known as "Liang" (涼) from 396 to 403. The Later Liang at its peak controlled the Hexi Corridor in Gansu with Guzang (姑臧, in modern Wuwei, Gansu) as their capital. After the Southern Liang and Northern Liang broke away in 397, their territory was gradually reduced to their capital region in central Gansu.

Qin, known in historiography as the Later Qin (simplified Chinese: 后秦; traditional Chinese: 後秦; pinyin: Hòuqín; 384–417) or Yao Qin (姚秦), was a dynastic state of China ruled by the Yao clan of Qiang ethnicity during the Sixteen Kingdoms period in northern China. As the only Qiang-led state among the Sixteen Kingdoms, it was most known for its propagation of Buddhism under its second ruler, Yao Xing, who sponsored the Madhyamakin monk, Kumārajīva to translate Sanskrit Buddhist text into Chinese.

All rulers of the Later Qin declared themselves emperors, but for a substantial part of Yao Xing's reign, he used the title Heavenly King. Historiographers gave the state the prefix of "Later" to distinguish it with the Former Qin and Western Qin as it was founded during the Former Qin's collapse after the Battle of Fei River and went on to conquer the Former Qin's power base in the Guanzhong. With Chang'an as its capital, the Later Qin also controlled Henan and vassalised the Western Qin, the four Liangs (Later, Southern, Northern and Western), Southern Yan, Qiao Shu, Chouchi and various tribes of the Ordos region.