There are two opinions about the change of Xu's surname: one thinks that four of Xu's students are admitted to Jinshi and serve as officials with the DPRK. In order to reward him for cultivating a pillar talent for the country, the emperor specially gave him a dragon robe and told him to go to the palace to see the coachman.
When he saw the driver, the emperor casually asked him if "xi" was his family name. Although he was full of knowledge, it was the first time to drive, so he was very nervous, so he rubbed his robe with his hand and failed to answer in time. Rubbing and rubbing, he was anxious and suddenly replied: "The attack of the dragon clothes."
Another way of saying this is that the skill of attacking chess is superb. After the emperor called him into the palace, he often played chess with the emperor. Once the emperor asked him to play chess, and he was dozing off under the tree. The emperor was afraid that he would catch cold, so he took off his dragon robe and put it on him. After waking up from the attack, I changed my surname to Yi Long's "attack" in order to thank the emperor.
Extended data:
Attack sb's qualifications
Zhaoshou will always build a prosperous future, and Wen Yuan Pizhen Yunchangshengde will continue the family road and the constitutional program of Tianze Huayu.
Named attacker
The attack word (the year of birth and death is unknown) is gram-shaped, and the word is clear. Zhangqiu people in Jinan in Ming Dynasty. When I was a child, my family was poor, thinking that people lived by herding sheep. I never put down my books. I read poetry whenever I have time. Because of this, I was beaten by the master and became more and more angry with my study. By the time he was 30, Xu had become famous by studying various books, such as classics, schools of thought contend and official novels.
At that time, Yuan Chongmian and Li Kaixian, scholars in the same county, were famous for their beautiful songbooks and songs. Xu, on the other hand, thinks it is harmful to fill in such lyrics and dismisses it. He and Yin Shizhen, Xu Bangcai, Li Panlong and other Licheng people all advocated filling in ancient Chinese characters. Li Panlong is arrogant and arrogant, but he admires the attack and the two become best friends.
After a bad career, he began to teach Jiangdu at the age of 60. Soon, he was transferred to Wei County, and later to Professor Wei of Kaiping. After resigning from his post, he returned to his hometown to support the elderly. Died five years later. He is the author of Mao Qing Ji, Illustration of Taiji and Debate of Life.
Baidu encyclopedia-Xi Shi