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During the Three Kingdoms period, after Emperor Wen of Wei, Cao Pi, passed away, Sima Yi and Cao Shuang co-governed alongside Emperor Cao Rui.
Following Cao Rui's death, Sima Yi eliminated Cao Shuang.
Sima Shi, Sima Yi's son, then installed Cao Mao as the new emperor.
Sima Zhao, Sima Shi's younger brother, held Cao Mao in contempt and brazenly sought to be enfeoffed as the Duke of Jin. Incensed, Emperor Cao Mao declared, 'Sima Zhao's ambition is known to every passer-by!'