In December 219, after Sun Quan designed to kill Guan Yu, he cut off Guan Yu's head, sent emissaries to Cao Cao, and wrote a letter, wanting to declare cao Cao a vassal, and urging Cao Cao to replace the Han Dynasty and proclaim himself Emperor of Wei.
Receiving Sun Quan's generous gift, Cao Cao was greatly surprised. For the current situation, the abolition of the emperor and self-reliance, Cao Cao did not think in his heart. But after seeing Guan Yu's first rank who had loved and killed each other for many years, Cao Cao suddenly felt in his heart that those past years were like a dream, and he began to emerge in his twenties, and for more than forty years, he had been struggling for an unknown goal.
Everyone in the world knows that Cao Mengde blackmailed the Son of Heaven to order the princes, but who knows that he has not been defending the orthodoxy of the Han Dynasty? After much thought, Cao Cao ordered guan yu's head to be buried outside Luoyang, accompanied by incense wood as Guan Yu's body. At the time of the burial, it was required that the civil and military officials must participate, and Guan Yu was posthumously named "King of Jing".
After dealing with Guan Yu's posthumous affairs, Cao Cao summoned his courtiers and read the letters that Sun Quan had persuaded him to depose and claim the title of emperor, and said, "Sun Quan, this guy is going to put me on the fire and roast me!" ）。
At this time, Cao Cao's courtiers also took the opportunity to persuade Cao Cao to advance, and simply deposed Emperor Xian of Han and became emperor himself. However, Cao Cao had already decided in his heart that he did not want to depose the emperor and stand on his own. So he said to them, 'If Providence has chosen me, then let me be king of Zhou Wen' (If the mandate of heaven is in me, I am king of Zhou Wen.' ）。
A month later, Cao Cao died of illness in Luoyang at the age of sixty-six, with the posthumous title of "King wu". Ten months later, history repeats itself again, and the Wei king Cao Pi forced Emperor Xian of Han to abdicate, changed Han to Wei, and posthumously honored Cao Cao as Emperor Wu and the temple name Taizu.
