Where do the Khitans come from?

China is called китай in Russian, literally translated as "Qidan". In the Middle Ages, from Central Asia to Western Europe, "Khitan" was always the general name of China. It is considered that the Khitan nationality is synonymous with ancient China, which shows the influence of the Khitan nationality on the world. The Khitans have long since disappeared from the earth, and most of them have integrated into the Han nationality. But until today, the influence of Qidan still spans Europe and Asia. As the main reason of China's common name, "Qidan" has become the general name of the main ethnic groups in northern China (Qidan, Han, Jurchen, Bohai, etc.). ) Through the ethnic integration in Liao and Jin Dynasties. Laoqida is a textbook for Koreans and Koreans to teach Chinese. In the form of conversation, the Seventh National Congress of the Communist Party of China described the experience of several Korean businessmen who went to China to do business and met a China businessman on the way to engage in trade activities in Dadu (Beijing) and other places. Its plot is coherent and extensive, involving travel, transactions, contracts, banquets and other aspects. Written in spoken language, this book is the most direct material for studying northern Chinese in Yuan, Ming and Qing Dynasties. With regard to the title of the book Old Qidan, the academic circles generally think that "Old Qidan" is the sound change of "Qidan", referring to China at that time. So "Old Seven" means "Old China", which means "China hands". 1998, South Korea discovered the Yuan Dynasty ancient edition of Laoqida, in which "Hutong" was written in Chinese before the Ming Dynasty. These books are authentic spoken languages in the north of Yuan Dynasty, which proves that Yuan people speak Chinese and the language of Yuan people is Chinese, which is of great value to the study of Chinese and society in Yuan Dynasty. The northern nomads who entered the Central Plains generally switched to Chinese, which is the "northern language" of Altai family, and was called "Chinese language" in history. "Old Beggar" also records that "I went to Yizhou and came to Korea's fields, all of which were Korean words". After Liao, Jin and Yuan Dynasties, the languages of northerners have been deeply mixed by the languages of all ethnic groups. This is why Korean textbooks for learning Chinese should be called "Old Khitan" instead of "Old Man Zi" and "Old Tangzi".