His father had appointed three regents for him—his distant cousin Cao Zhen, the steady administrator Chen Qun, and the shrewd strategist Sima Yi.
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Instead of realizing that it was indeed a trap, Cao Rui enthusiastically approved Cao Xiu's plan, and this led to a major military disaster, but Cao Xiu's forces were saved by Jia Kui from total annihilation.
In 236 under the order of Emperor Ming of Cao Wei, Sima Yi conquered the Gongsun family and annexed Liaodong, Lelang and Daifang to Wei.
It chronicles tributary relations between Queen Himiko of Wa (Japan) and the Wei court, and records that in 239 CE, Emperor Cao Rui sent presents to Himiko, including "one hundred bronze mirrors" (tr. Tsunoda 1951:15).
Cao Cao | Cao Wei | Rui Costa | Pierre Cao | Cao Zhen | Cao Rui | Cao Đài | Văn Cao | Nguyen Cao Ky | Joseph Cao | Cao Xiu | Cao Gangchuan | Cao Bằng Province | Zhu Rui | Rui Faria | Manuel Rui | Huang Rui | Cao Yunding | Cao Ying | Cao Xueqin | Cao Pi | Cao Hamburger | Cao Fang | Wu Rui | Terence Cao | Su Rui | rui (tree) | Rui Rio | Rui da Silva | Rui Bandeira |
His successor Cao Rui sent Cao Xiu to launch the last invasion of Wu during this campaign at Shiting.
In 226, as Cao Pi laid on his deathbed, he entrusted his successor Cao Rui to the care of Sima Yi, Cao Zhen, and Chen Qun.
In 227, Cao Rui ascended the throne of Wei upon the death of his father Cao Pi.
The Wei official Jiang Ji suggested to Cao Rui to reassign Bi Gui to another province on the grounds that Bi was not competent enough to govern Bing Province, an important location in Wei.