When did Jin officially move to Yanjing?

1 123, Song and Jin jointly crusaded against Liao and captured Yanjing. After the Song and Jin Dynasties made peace, Yanjing returned to the Northern Song Dynasty and established Yanshan Mansion. Because it is near the foot of Yanshan Mountain, Yanjing is also called Yanshan Mountain.

1 126, the capital of the northern song dynasty was attacked by the Jin army, and two emperors, Song Huizong and Song Qinzong, as well as more than 3,000 royal families and bureaucrats, became prisoners, and the northern song dynasty perished.

1 15 1 April, King Wan Yanliang of Jin Hailing issued a letter to move the capital to Yanjing from Huining House in Shangjing, and appointed Shangshu Youhao, Yanjing to stay and Daming Yin Luyanlun to be responsible for the expansion of Yanjing City and the construction of the palace.

1 153, the state of Jin officially moved its capital to Yanjing, and the fourth emperor of Jin, Yan Yanliang, followed the "five capitals" system of Liao and designated Yanjing as the new capital of Daxing. In addition, four supporting capitals have been appointed, namely, Dading Prefecture in Beijing, Kaifeng Prefecture in Nanjing, Liaoyang Prefecture in Tokyo and Datong Prefecture in Xijing.