Fu Wan 伏完

In Chapter 20 of the Romance, when Cao Cao blocks the Son of Heaven's way during the hunt at Xutian and receives the cheers of 'Long live!', Emperor Xian returns to the palace and weeps to Empress Fu, lamenting Cao Cao. When the empress asks whether there is not a single person who can save the state from its peril, Empress Fu's father Fu Wan comes in from outside and says he will recommend a man who can rid the state of its bane. When the emperor asks whether the Imperial Father-in-law too knows of Cao Cao's tyranny, Fu Wan replies that no one failed to see the shooting of the deer at Xutian, and that since everyone at court is either of Cao Cao's clan or one of his followers, who but an imperial in-law would attack the traitor? He then recommends the General of Chariots and Cavalry and Imperial Uncle Dong Cheng as one to be trusted with the task, since he himself, an old minister, has no power. Romance, Ch. 20 §14 · 17–19

Warning that Cao Cao's trusted men are all around His Majesty and that if the matter leaks the disaster will be no small one, Fu Wan proposes a plan: to make a robe, choose a jade belt and secretly bestow them on Dong Cheng, sewing a secret edict into the lining of the belt. The emperor agrees, bites his fingertip and writes the secret edict in blood, then has Empress Fu sew it into the lining of the jade belt. Romance, Ch. 20 §20–21

In Chapter 66, when Cao Cao enters the palace wearing his sword and threatens the emperor, and word comes that the Duke of Wei means to make himself king, Empress Fu says that her father Fu Wan has always harbored the wish to kill Cao Cao and that she will write him a letter so they can plot together. The eunuch Mu Shun hides the secret letter in his hair and delivers it to Fu Wan's house, and Fu Wan says that Cao Cao has very many trusted followers, so he cannot be moved against in haste. Only when Sun Quan in Jiangdong and Liu Bei in Xichuan raise troops outside and Cao Cao goes out in person, he says, should they attack him from inside and outside together with the loyal ministers at court. At Mu Shun's suggestion, Fu Wan writes a reply and gives it to him. Romance, Ch. 66 §34–38

But someone has already informed Cao Cao, and Cao Cao, waiting at the palace gate, grows suspicious when Mu Shun puts his cap on backwards and finds Fu Wan's letter in his hair. Seeing that it speaks of joining hands with Sun Quan and Liu Bei so that they would respond from outside, Cao Cao raises 3,000 armored troops overnight, surrounds Fu Wan's private residence and arrests everyone, old and young, and when he finds the letter in Empress Fu's own hand, he throws the three branches of the Fu clan into prison. That night, the day he has the empress beaten to death with clubs, more than two hundred members of the clans of Fu Wan, Mu Shun and others are all beheaded in the marketplace. The Romance dates this to the 11th month of the 19th year of Jian'an (214). Romance, Ch. 66 §39–40 · 48–49

In Chapter 78, the ailing Cao Cao sees in his bedchamber at night more than twenty people, including Empress Fu, Dong Guifei, the two imperial sons, Fu Wan and Dong Cheng, standing covered in blood within gloomy clouds and demanding his life. When Cao Cao draws his sword and slashes at the empty air, a corner at the southwest of the hall collapses. The next day Xiahou Dun too sees them at the door of the hall, faints, and from then on falls ill. Romance, Ch. 78 §26 · 28