In history, Sun Quan's sister was overbearing and had nothing to do with Liu Bei. Liu Bei built a city in Gongan County, west of Jingzhou Gongan City. What's his name? Baling city? Or? Mrs. Sun's city? . The basic reason is that two people can't get along, so they separated. But as a vassal, Liu Bei knew the necessity of political marriage, and even for the sake of his career, Liu Bei would not refuse. Liu Bei accepted the concept of political marriage, so why didn't Guan Yu accept and insult Sun Quan? In character, Guan Yu values his subordinates more than doctors. To put it bluntly, Guan Yu is a grassroots hero. He looked down on literati, even Sun Quan and Guan Yu. His arrogant personality makes him look down on anyone. Although Sun Quan is the king of the East, he despises Sun Quan. Coupled with the dispute between Shu Han and Soochow, Guan Yu criticized Sun Quan even more, so it is not surprising that Guan Yu took the opportunity to humiliate Sun Quan. And Sun Quan courted Guan Yu, which was Guan Yu's most brilliant moment. He Guan Yu, the famous China, wanted to move the capital temporarily in order to avoid Guan Yu when he was fighting Cao Cao. Guan Yu himself is an extremely conceited person, so Guan Yu is even more self-righteous. He may think that Sun Quan married him because he was afraid of himself. So the arrogant Guan Yu triumphed and humiliated Sun Quan. After all, he is not Liu Bei, and he does not need to consider the issue of alliance. At that time, the arrogant Guan Yu even thought that he could destroy Suzhou at any time. Because of this, Guan Yu paid the price for the hubris that followed. Out of shame, Sun Quan formed an alliance with Cao Cao and attacked Guan Yu. Guan Yu's death not only made Liu Bei lose Jingzhou, but also broke the alliance between Sun and Liu. Therefore, Guan Yu's death was entirely caused by him, and there is nothing worthy of sympathy.