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The name of Japan is not obtained by the Japanese themselves, but by our Chinese to obtain it for them. Before Japan took this name, it was not called Japan, but "Uighur". Wo means a short man, and woe means that the whole country is a short man.
The Japanese had no culture at that time, did not give themselves a name, and did not know what to call their country, so they sent people to China. At that time, China was in the Western Han Dynasty, and the emperor of the Western Han Dynasty saw that they were short, so he gave them the name of Wuguo.
The Japanese had their own name, were very happy in their hearts, and went back happily. Time passed quickly, and time came to the Tang Dynasty. The Japanese loved to learn, and they sent a large number of emissaries to the Tang Dynasty to learn cultural knowledge.
As the cultural knowledge of the Japanese increased, they knew that the name Ofo was sarcastic, and they did not want to use the name anymore, and wanted to change the name. Some people asked, if the Japanese want to change their names, they can't just change their own names, so why should the Tang Dynasty change it? Because Japan has great respect for the Tang Dynasty, Japan is a vassal state of the Tang Dynasty, and they are afraid of changing the name of the country, so they are afraid of not doing a good job, so they ask the Tang Dynasty to change it.
At this time, the Tang Dynasty was in power of Wu Zetian, and the empress was busy during the day and even busier at night, and there was no time to take care of Japan. According to the New Book of Tang, Japanese emissaries repeatedly requested Wu Zetian to change the name of the country, but Wu Zetian ignored it.
The Japanese emissary felt that the matter could not be postponed any longer, so he made Wu Zetian drunk at a banquet, and while Wu Zetian was drunk, asked the empress to change the name of the country. So why did it change its name to Japan? The Japanese consider themselves to be the "land of the sunrise" and are closest to the sun, hence the name Japan.
After Wu Zetian named Japan, they have been using the name of Japan. The name of Japan was taken by Wu Zetian, so who took the name of Korea? The Classic of Mountains and Seas records that "within the East China Sea, in the corner of the North Sea, there are national names such as Korea and Heavenly Poison." ”
After King Ji of Wu cut the silk, the Shang Dynasty widowEduji was unwilling to surrender, so he came to Korea and established the "Jizi Joseon" here. Although the Korean Peninsula is not large, there are no more wars, and Goryeo and Goguryeo countries have been established.
In 1392, Lee Sung-gyu overthrew the Goryeo Dynasty and established himself as king. Li Chenggui established a new dynasty and was about to change the name of the country, so he wrote to Zhu Yuanzhang and asked him to give him a name for the country.
Zhu Yuanzhang's cultural level is limited, and he is afraid that he will be laughed at by people, so he laughs. Li Chenggui also saw Zhu Yuanzhang's difficulties, so he changed the fill-in-the-blank question to a multiple choice question and let Zhu Yuanzhang choose.
Li Chenggui found two national names, one was "North Korea" and the other was "Hening", and asked Zhu Yuanzhang to pick out one of them. After Zhu Yuanzhang thought twice, he chose North Korea as the national name, and since then North Korea has been passed down and become the national name.
References: Book of Han, New Book of Tang, History of Ming, etc