Cuizi (崔子) was a high-ranking minister in the state of Qi (齊) and is said to have assassinated its ruler Duke Zhuang (齊莊公) in 548 BCE after discovering that the duke was having a secret affair with his wife Tang Jiang (棠姜).
Although he ensured the succession of the dead duke’s brother, Duke Jing (齊景公), to the throne and thus maintained his ministerial position, Cuizi lost out in a political struggle against a fellow collaborator in the murder called Qing Feng (慶封), who ordered his whole family to be killed. In 546 BCE, Cuizi committed suicide.
Appearances in the Analects of Confucius
Book 5, Chapter 19
Zizhang asked: “Ziwen was appointed chief minister three times, but he never showed the least sign of elation. He was dismissed three times, but he never showed the least sign of disappointment. On each occasion, he briefed his successor on the status of the affairs of his office. What do you think of him?” Confucius said: “He was loyal.” Zizhang asked: “Was he a good person?” Confucius said: “I’m not sure; how can he be said to be a good person?”
“When Cuizi assassinated the ruler of the state of Qi, Chen Wenzi abandoned his large estate of ten chariots and left Qi. Having settled in another state, he said: ‘They are no better than Cuizi,’ and left. Having settled in yet another state, he said once again: ‘They are no better than Cuizi,’ and left once again. What do you think of him?” Confucius said: “He was pure.” Zizhang said: “Was he a good person?” “I’m not sure; how can he be said to be a good person?”