Duke Wen of Jin

Duke Wen of Jin (697–628 BC), personal name Ji Chong'er, was duke of the Jin state from 636 BC to 628 BC. He was exiled from Jin for approximately 20 years before finally assuming the throne and rapidly leading Jin to hegemony over the other Chinese states of his time.

Duke Wen is a figure in numerous Chinese legends, including those about his loyal courtier Jie Zhitui, whose death is said to have inspired China's Cold Food Festival and Qingming Festival.

"Duke Wen of Jin" is a posthumous name bestowed on him as part of his family's ancestral veneration. It literally means the "Cultured Duke of Jin". Duke Wen's given name was Chong'er. His clan name was Ji.

Prince Chong'er was born to Duke Xian of Jin in 697 BC. The Zuo Zhuan notes that "his ribs were all grown together," a sign of strength and leadership. Chong'er's half-brothers included Shensheng and Xiqi. While Shensheng was the original crown prince, in his later years Duke Xian favoured the concubine Li Ji, who desired her son Xiqi to be heir instead. As such, she plotted to discredit Shensheng before his father, eventually leading to Shensheng's suicide in 656 BC.

This event led to a civil war in Jin, known as the Li Ji Unrest, where Duke Xian led several campaigns against his own sons, forcing them to flee Jin. With a retinue of capable men, including Zhao Cui, Hu Yan, Wei Chou (魏犨), Jia Tuo (賈佗), Xian Zhen (先軫), and Jie Zhitui, Chong'er fled to the north. In 651 BC, after the death of Duke Xian led to a succession crisis, Chong'er was invited to return to Jin and assume the duchy, but declined; the throne passed instead to his half-brother Yiwu, who became Duke Hui of Jin.

In 644 BC, after failed assassination attempts by Duke Hui, Chong'er moved to the State of Qi. He remained there until yet another succession crisis in Qi in 639 BC, whereupon he fled first to the State of Cao, then the states of Song, Zheng, Chu and finally the State of Qin. Over this 19-year period of exile, Chong'er gained both prestige and talented followers; a lady of a foreign court once commented that "When I look at the followers of the prince of Jin, every one of them is fit to be a premier of a state".

In 636 BC, after the death of Duke Hui, Duke Mu of Qin escorted Chong'er back to Jin with an army, and Chong'er was installed as the Duke of Jin.

Duke Wen undertook several major reforms of the state's military and civil institutions, partly in order to fill the gaps that had been caused by the slaughter of the ducal house previously. These included the formation of a three-army system, with an upper, middle and lower army each commanded by a General and a Lieutenant-General. The state was further invigorated by the many capable leaders Duke Wen had gathered from his wanderings, who were given senior military and governmental posts.