Xu Yun 許允

In the 1st month of the 1st year of Jiaping (249), when the imperial carriage went to pay homage at the Gaoping Tomb and Cao Shuang and his brothers all accompanied it, Sima Xuanwang (Sima Yi) raised troops and memorialized that the officials and troops of Cao Shuang and his brothers be dismissed. Cao Shuang, withholding the memorial from the Son of Heaven, was driven into a corner, and although the Minister of Agriculture Huan Fan urged him to move the imperial carriage to Xuchang and summon troops from outside, Cao Shuang and his brothers hesitated and could not decide. Records, Wei 4 §28Records, Wei 9 §80 · 83–85

At this point the Palace Attendant Xu Yun and the Master of Writing Chen Tai persuaded Cao Shuang to admit his guilt without delay. Cao Shuang thereupon sent Xu Yun and Chen Tai to Sima Xuanwang to admit his guilt and beg for death, and only then passed Sima Xuanwang's memorial on to the Son of Heaven. Cao Shuang and his brothers were dismissed from office and returned to their residences as marquises, and later, on Zhang Dang's testimony, they were executed together with He Yan and the others. Records, Wei 9 §85 · 87–88

When Sima Jingwang (Sima Shi) newly took charge of the government, Wang Ji wrote to admonish him, saying that Xu Yun, Fu Gu, Yuan Kan and Cui Zan were all upright men of their age, of straightforward character and with no inclination to drift with the tide, and were men with whom he could share the affairs of government. Jingwang accepted his words. Records, Wei 27 §59

Xu Yun of Gaoyang, Central Commander of the Army, was on close terms with Li Feng and Xiahou Xuan. Before this, someone had forged a foot-and-an-inch edict appointing Xiahou Xuan General-in-Chief and Xu Yun Grand Commandant, to take charge together of the affairs of the Masters of Writing (lu shangshu shi). Before dawn a man rode up on horseback, handed the edict tablet to Xu Yun's gatekeeper, said, 'There is an edict,' and at once galloped away. Xu Yun immediately threw the document into the fire and burned it, without opening it or presenting it to Sima Jingwang. Records, Wei 9 §128

Li Feng, Prefect of the Palace Writers, joined with Zhang Ji (張緝), Grandee of Splendid Happiness and father of the empress, in a plot to have Xiahou Xuan assist the government, and planned to kill the General-in-Chief by taking advantage of the occasion in the 2nd month of the 6th year of Jiaping (254) when an Honored Lady was to be invested. The General-in-Chief Sima Jingwang caught wind of the plot, summoned Li Feng and killed him on the spot, and Xiahou Xuan, Zhang Ji and the others were arrested and sent to the Commandant of Justice. Records, Wei 9 §122–124

After the affair of Li Feng and the others came to light, Xu Yun was transferred to General Who Guards the North, granted the tally and put in charge of the military affairs of Hebei. But before he set out, he was arrested for distributing government property without authority and handed over to the Commandant of Justice, and he died on the road while being exiled to Lelang. Records, Wei 9 §128

Chen Shou records that Wang Jing of Qinghe was also spoken of together with Xu Yun as a noted scholar of Ji Province, and adds that Wang Jing, after becoming a commandery administrator, could not follow his mother's advice to stop there and in the end came to ruin. He also says that Cui Zan, a friend of Xu Yun from the same commandery, had once warned Xu Yun that his manner of living in the world was too grand. Records, Wei 9 §130

In his assessment at the end of Records of Wei 9, Chen Shou assessed only Cao Shuang and Xiahou Xuan and did not assess Xu Yun separately. Chen Shou's main text does not record Xu Yun's courtesy name or the year of his death. Records, Wei 9 §132 · 127–128