Yan was an important feudal country from the Western Zhou Dynasty to the Warring States Period. With regard to its original title, Yan Zhaogong Family, Volume 34 of Historical Records, clearly recorded that "Zhou Wuwang was destroyed and Zhao Gong was sealed in North Yan". Volume 4 of Historical Records and Zhou Benji also said that he was "called Yan" after cutting. Zhao Gongming Ying, surnamed Ji, is an aristocrat with the same surname, and is known as the food city. He, He and Tai Gong Wang were both important ministers of the founding of the Western Zhou Dynasty, and they were also the most trusted and relied on people. Yan Wang Zhao Xiang (? -279 years ago), when he was in office, he attacked East Lake to build the Great Wall, and attacked Qi in the south, and Yan reached its peak.
In the thirty-third year of Yan State (222 BC), after Qin destroyed Korea, Wei and Chu, Wang Ben was sent to attack Liaodong, the Yan army was defeated, Yan State was captured and Yan State perished. Li Gongdai was captured on behalf of Wang Jia. Yan Liaodong's hometown and generation land were set as Liaodong county and generation county by Qin respectively.
From the Ming Dynasty, the Northeast was called "Kanto", and it was only in the Qing Dynasty that it was called "the three northeastern provinces". Although Fengtian, Jilin and Heilongjiang provinces were all under the jurisdiction of generals before the establishment of 1907, the "three eastern provinces" were already the general name of this area in the Qing Dynasty. For example, it is recorded in the Record of Emperor Gaozong of the Qing Dynasty: "The case of deputy commander-in-chief of the three northeastern provinces has been confirmed. In Shengjing, Jilin, Heilongjiang and other places, because the folk customs are simple and the places are quiet, the flag members of the three provinces are all here, even the deputy commander-in-chief and city guards have simple places ... "
For example, it is clearly pointed out in Jiaqing's Qing Hui Dian: "Shengjing, Jilin and Heilongjiang are the three northeastern provinces in the north." [2] In Jiaqing years, Xiqing wrote the book "The Collection of Heilongjiang", which also said: "Heilongjiang is now one of the three northeastern provinces." It can be seen that in the early Qing dynasty, even before the establishment of the province, the northeast region under the jurisdiction of the general was called the "three eastern provinces."
By the end of the Qing Dynasty, the term "Three Eastern Provinces" was more common, such as 1885 Map of the Three Eastern Provinces written by Cao Tingjie, 1902 Delivery Treaty of the Three Eastern Provinces between China and Russia, and 1905 Sino-Japanese Conference Treaty on the Affairs of the Three Eastern Provinces. 1907 Northeast China was restructured, and the Qing court officially set Fengtian (Shengjing), Jilin and Heilongjiang, which were originally under the jurisdiction of generals, as provinces, and appointed governors in each province, placing a member of the governors in the three northeastern provinces. At this point, the three northeastern provinces have become official names, also known as the three northeastern provinces.