Jin (Chinese state)

The state of Jin was a major political power during the middle of the Zhou dynasty. It was located in the center of ancient China on the Shanxi plateau. The state sat in the lower Fen River drainage basin. This location was very strategic for several reasons. To the north were the Xirong and Beidi peoples. To the west lay the Lüliang Mountains and the Loess Plateau. To the south were the Zhongtiao Mountains and the Yellow River valley. This position allowed Jin dukes to expand in many directions. They could move north to absorb tribes or southwest to fight the state of Qin. They could also move southeast to reach smaller Zhou states.

Jin began as a fiefdom granted by the Zhou kings. King Cheng of Zhou gave the land of Tang to his brother, Tang Shuyu. This land was located west of modern Yicheng County. Tang Shuyu held the rank of a marquis. Later, his son, Marquis Xie, changed the name of the state from Tang to Jin. During the early Western Zhou period, there is little information about Jin. However, the state grew significantly during the Spring and Autumn period. One major turning point occurred in 771 BC. Nomads called the Quanrong drove the Zhou out of the Wei River valley. This event changed the political landscape of the entire region.

Internal struggles also shaped the history of Jin. A fragment of the state called Quwo broke away for many years. From 745 to 677 BC, the rulers of Quwo attempted to take over the main Jin state. In 678 BC, Duke Wu of Quwo finally conquered Jin. He killed Marquis Min to take control. A year later, the King of Zhou officially recognized Duke Wu as the legal ruler of Jin. This established the Quwo line of rulers. This new line helped Jin become the most powerful state for several generations.

Duke Xian and Duke Wen were two of the most important leaders in Jin history. Duke Xian broke with traditional Zhou feudalism. He ruled by using appointees from different social backgrounds rather than just relatives. He annexed many small states and absorbed several Rong tribes. His son, Duke Wen, experienced a long period of exile. He spent 19 years living in other courts before returning to power in 636 BC. Duke Wen became a famous leader known as a hegemon, or "ba." He led a military alliance to defeat the state of Chu at the Battle of Chengpu in 632 BC. This was perhaps the largest battle of the Spring and Autumn period.

Jin maintained a highly organized and complex military system. The state eventually utilized three main armies: the upper, central, and lower armies. Each of these three armies contained 12,500 soldiers. The central army was the most prestigious of the three. Its commander, the Zhongjunjiang, also served as the prime minister of Jin. This official held the title of Zhengqing. Other military ranks included the Junjiang, who was a commander. They were assisted by a Junzuo. There were also subordinate roles like the Junsima and the Junwei.

Over time, the power of the Jin dukes began to fade. Control shifted from the central rulers to powerful aristocratic families called clans. By the time of Duke Zhao, the dukes were mostly figureheads. Six specific clans controlled the state: Fan, Zhonghang, Zhi, Han, Zhao, and Wei. These clans eventually fought each other for dominance. In one major conflict, the Zhi clan tried to take territory from the Zhao clan. However, the Han and Wei clans switched sides during a siege at Taiyuan. The three weaker clans joined together to destroy the Zhi clan. They then divided the land among themselves.

This internal division led to the formal end of the state. In 403 BC, the Zhou court officially recognized three successor states: Han, Zhao, and Wei. These three groups were known as the "Three Jins." This partition marked the end of the Spring and Autumn period. It also signaled the beginning of the Warring States period. While the state of Jin existed nominally for a few more decades, historians believe it ended around 369 BC. The transition from one unified state to three competing ones changed Chinese history forever.