Founding According to chapter 45 of the
Records of the Grand Historian, the royal family of Han was a cadet branch of the royal family of the state of
Jin. The founder of the Han clan
Wuzi of Han was the uncle of
Duke Wu of Jin. Members of the family became ministers in the powerful state of
Jin and were granted
Hanyuan (modern
Hancheng in
Shaanxi).
Spring and Autumn period During the
Spring and Autumn period, members of the Han family slowly gained more and more influence and power within
Jin. Han's highest point occurred under the rule of
Marquess Xi. Xi appointed
Shen Buhai as his
chancellor and implemented his
Legalist policies. These reforms improved state administration and strengthened its military capability. Under King
Xuanhui ( 332–312 BC), Han declared itself an independent
kingdom. However, Han was disadvantaged in the competition of the Warring States period because Jin's partition had left it surrounded on all sides by strong states:
Chu to the south,
Qi to the east,
Qin to the west, and
Wei to the north. Han was then the smallest of the seven states and was without any easy way to further expand its own territory and resources, It was bullied militarily by its more powerful neighbors.
Defeat During its steady decline, Han eventually lost the power to defend its territory and had to request military assistance from other states. The contest between Wei and Qi over control of Han resulted in the
Battle of Maling, which established Qi as the pre-eminent state in the east. In 260 BC,
Qin's invasion of Han led to
Zhao intervention and the
Battle of Changping. During the late years of the era, in an attempt to drain Qin's resources in an expensive public works project, the state of Han sent the civil engineer
Zheng Guo to Qin to persuade them to build a canal. The scheme, while expensive, backfired spectacularly when it was eventually completed: the irrigation abilities of the new
Zhengguo Canal far outweighed its cost and gave Qin the agricultural and economic means to dominate the other six states. Han was the first to fall, in 230 BC. In 226 BC, former nobility of the Han launched a failed rebellion in former capital Xinzheng, and King An, the last king of Han, was put to death the same year.
Han Xin was made a "Prince" or "King of Han" () by
Liu Bang after the establishment of the
Han dynasty (). He was removed to
Taiyuan Commandery and the territory of the
kingdom of Dai, where he defected to the
Xiongnu and led raids against the Han Dynasty until his death. ==Culture and society==