In the history of China, the Three Kingdoms era was an era full of heroes. Among them, Lu Bu and Guan Yu are two highly regarded military generals. Was Guan Yu the "best in the world" after Lu Bu's death? This is a controversial issue. Below, we will explore this issue from several aspects.

First, we need to understand the strength of Lu Bu and Guan Yu. Lu Bu was known as the "Flying General" with exceptional martial arts skills and remarkable bravery. He had demonstrated his prowess on the battlefield many times, terrifying enemies. Guan Yu, on the other hand, was an important general under Liu Bei. His martial arts skills were also extraordinary, and he performed well in battles such as crossing five forts and killing six generals. Thus, in terms of strength, both Guan Yu and Lu Bu were powerful military generals.

However, did Guan Yu become the "best in the world" after Lu Bu's death? This requires considering the historical background and the performance of other military generals. Here are several factors that may affect this judgment:

1. Competitors: During the Three Kingdoms era, apart from Lu Bu and Guan Yu, there were many other excellent military generals such as Zhang Fei, Zhao Yun, and Ma Chao. Their existence made it difficult to easily achieve the title of "best in the world".

2. Battlefield Performance: Although Guan Yu performed well in many battles, he also had some defeats. For example, he was defeated by Cao Ren in the Battle of樊城 and lost to Lu Xun in the Battle of夷陵. These defeats also affected people's evaluation of him.

3. Historical Evaluation: In the "Romance of the Three Kingdoms," author Luo Guanzhong highly praised Guan Yu, portraying him as a loyal, brave, and benevolent figure. However, in the official history "Records of the Three Kingdoms," Chen Shou's evaluation of Guan Yu was more objective and did not rank him as the "best in the world".

In conclusion, although Guan Yu was an outstanding military general during the Three Kingdoms era, there is still some controversy about whether he was the "best in the world". This requires considering various aspects such as the historical background, the performance of other military generals, and historical evaluations. Nevertheless, Guan Yu, as a prominent figure in the Three Kingdoms era, will forever be praised for his loyalty, bravery, and martial arts skills by future generations.

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