Cao Rui (in Chinese: 曹叡), also known as Emperor Ming (in Chinese: 明帝), is one of the major characters in the 14th-century Chinese classic novel Romance of the Three Kingdoms by the late Luo Guanzhong, and its multiple adaptations. He is Cao Pi and Lady Zhen's son and the second emperor of Wei.
Cao Rui is often portrayed as a smart and gentle man, he was said to be a incompetent ruler who has learned many knowledge like his father. They are came across a doe and a fawn, his mother is killed by Cao Pi due to her sins and buried in Yucheng, Cao Rui was condemned to his plains. In the following year, Cao Pi resumed his title. At first, Cao Pi thought that Cao Rui had previously had dissatisfaction and he wanted to establish Cao Li, who was born by Consort Xu, so he did not stand for a long time. During this period, Cao Rui's family officials, teachers, and friends, all of them only take the integrity of the people, help each other, encourage correction. He has a very good relationship with Wei Zhen, but they are often discuss the things and books together.
Cao Pi also asked Wei Zhen about Cao Rui's situation, Wei Zhen praised him for his reason and virtues. After Cao Pi dies, Cao Rui took the throne and become a new ruler of Wei, he was placed under the regency of his stepmother, Lady Guo. When Sun Quan attacked Jiangxia and Wen Ping insisted, the most courtiers discussed and sent troops to rescued, Cao Rui believed that Wu forces was good at water warfare. Wen Ping is defensive and sudden attack, but the following hiring has been able to compete with them and they do not have a clear advantage. Prior to this, Cao Rui had sent a book to Xun Yu to help the soldiers, but they were learned the news of the Wu army's invasion. They are gathered the soldiers and horses along the way to Jiangxia, plus thousands of people riding their guards from others.
Arriving outside the city of Jiangxia, he commanded the army to attack the Wu army by the mountain fire. Cao Rui led the troops to against Wu, Wu forces is already retreated. They are invaded Wei, led by Lu Xun's commander-in-chief, he fought with Wu and defeated them with the help of General Man Chong and General Zhang Qiu. When Lady Guo died, he completely controlled Wei. However, he led his army to participate in the election campaign of Gongsun Yuan. But before he won, he died of illness and was inherited by his adopted son Cao Fang. At the time, he was only 9 years old, so Cao Rui appointed a weak Cao Shuang and a powerful and awkward Sima Yi - a fatal mistake because Sima Yi's grandson and sons controlled the Wei government and seized the throne.
- During his reign, he was known for being able to entrust the right people for the most appropriate positions, but it was argued that his lavish spending in palaces drained Wei's treasury.