Wei Jiang Executes Yang Gan's Charioteer and Submits Himself for Punishment

In 570 BC, Yang Gan, younger brother of Duke Dao of Jin, disrupted the military formation at Quliang. Wei Jiang, serving as Zhongjun Sima (military judge), enforced discipline by executing Yang Gan’s charioteer, as the law did not permit directly punishing a noble. Duke Dao, initially enraged, threatened to kill Wei Jiang for humiliating his brother. Wei Jiang then came to the court, presented a written remonstrance arguing that upholding military law was vital for the state, and prepared to commit suicide to atone for offending the ducal house. After reading the letter, Duke Dao realized his mistake, rushed out barefoot to stop Wei Jiang, apologized sincerely, and promoted him to a higher command. The case highlights the tension between aristocratic privilege and the impartial rule of law.

Duke Dao of Jin, upon understanding the necessity of law enforcement, exonerated Wei Jiang, halted his suicide, and promoted him to Assistant Commander of the New Army (Xin Jun Zuo) as a reward for his rectitude.

Whether military law should apply strictly to the ruler’s own relatives; whether executing a servant instead of the offending noble satisfied justice; and the legitimacy of a subordinate humiliating the ducal family in the name of law.

The case set a lasting precedent for holding the powerful accountable under military law, bolstered Jin’s internal discipline, and became an enduring symbol of a minister’s courage to enforce laws impartially even against royal kin. It reinforced the principle that the state’s survival depends on the rule of law over personal ties.