During the yan zhaogong period, the state of Yan set up five counties of Shanggu, Yuyang, Youbeiping, Liaoxi, and Liaodong, of which the more prosperous ones were the land of Shanggu and Yuyang, and the national strength of the Yan state also increased during this period. The cultivation of the two generations of monarchs of Yan Zhaogong and Yan Wugong did not seem to have really freed the Yan state from the trend of decline, and the subsequent Yan Qianwen Duke faced a dilemma.
The Former Duke of Yan was active in the State of Yan, about 554 BC to 545 BC, during this time when the Jin-Chu hegemonic war in the Central Plains entered the middle and back fields, and the Neighboring State of Yan also often launched confrontations with the State of Jin, and many princely states gradually developed a sense of fatigue from the war, and the discussion of soldiers was emerging in the south.
Relative to the cessation of middle-earth, the Rongdi tribes in the northern region were gradually becoming stronger, and the State of Qi was busy dominating the Jin State, and its support for the surrounding vassal states was weakened, including its own assistance to the State of Yan. Another neighbor of the State of Qi, the State of Lu, was still waging a war of aggression against small neighboring countries. Wars of scale throughout the period were constantly decreasing.
The history books have: "Yishui and east of Yi County, south of the ancient city, Xi Yan Wen Gong Migrated Yi, that is, this city also", why did Yan Qian Wen Gong choose to migrate the capital to YiCheng? Judging from the five counties set up by the Duke of YanZhao in that year, Western Liaoning and Liaodong were for the defense of the old Yin Shang clan and Rong Di in the northeast, and the right Beiping was the northern gate of the Rong Di tribe in the north to attack the Yan state, and further south was Yuyang, and Yuyang was more of an important city of the Yan state, and most of the many political and military forces of the Yan state were deployed here.
In that year, the Yan kingdom moved to the capital several times, and the development time was relatively long in the Yuyang area, and the most famous Jicheng in the Yan kingdom was in this area, indicating that the yan power in the Yuyang area was relatively more important. Yicheng, on the other hand, was more southward, and Wengong of Yanqian migrated southward, apparently under threat. The greatest threat is still from the north. Since Yuyang was an important area, why didn't Duke Wen of Yanqian stay here, but to the south. There was only one possibility, that the military threat from the northern Rongdi had penetrated deep into the city of Jicheng.
In Yicheng, Yan Qianwen Duke looked at Yi Shui flowing east, I don't know if I can imagine it, under the efforts of the previous two monarchs Yan Zhaogong and Yan Wugong, the Yan Kingdom has already had a very good development, Yan Qianwen Duke himself can not keep this family business, on the one hand, because the southern princes are weak, the Northern Rong Di tribe took advantage of the rise, on the other hand, it may be the problem of Yan Qianwen Gong itself.
Yan Qianwen Gong either suffered the curse of "rich but not more than three generations", or encountered the pattern of no ministers in the country, anyway, when the southern flag was stopping, the development of the Yan people also stepped on the brakes, and the Yan kingdom, which had not been invaded for several generations, may have been violently attacked by Rong Di, which would also lead to Yan Qianwen Gong choosing to migrate to the capital to avoid disaster. Imagine that the grandfather of Duke Wen of Yan, that is, Duke Zhaogong of Yan, also attacked Donghu in the east, set up five counties, and built the Great Wall, and the destruction of the Great Wall was only between three generations, and the Duke of Yanqian Wengong could be described as sad.
Interestingly, in the history books, there are: "Driving Zhao and attacking Yan, then the Great Wall of Yishui, not the great king of the king", the land of Yi County is obviously very close to the land of Jin Zhao, Yan Qianwen Gong chose to migrate here, obviously to find a stronger backing and support, that is, to use the power of the princes of the Central Plains, just like when the Duke of Yan zhuang used the power of the Duke of Qi Huan to attack the shanrong, lone bamboo and other countries, the real opportunity to let the Yan kingdom be reborn.