
One of the Five Hegemons of the Spring and Autumn period.
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Duke Wen of Jin (then Prince Chong'er) was forced into exile for 19 years after a political purge in Jin. He traveled through several states, gaining experience and allies, before returning to claim the throne of Jin in 636 BCE.
Upon returning to power, Duke Wen implemented administrative and military reforms in Jin. He reorganized the army into three divisions, promoted talented officials regardless of birth, and established a legal code, strengthening Jin's governance.
Duke Wen of Jin defeated the state of Chu at the Battle of Chengpu, the largest battle of the Spring and Autumn period. The victory established Jin as the dominant power and Duke Wen as the hegemon of the Chinese states.
After the Battle of Chengpu, Duke Wen convened a major alliance of states at Jiantu, where he was formally recognized as hegemon. He also received a mandate from the Zhou king to lead military campaigns, solidifying his authority.
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