Upon the death of Situ Lei, when his successor, Situ Yu, took the throne and announced his internal surrender to Yan State, Situ Yi, the eldest son of the Situ Family and Situ Lei's older brother, declared himself Emperor within Jade Plate City, located on the eastern bank of the Wang River.
At the beginning of his reign, Situ Yi immediately issued seven Imperial Edicts.
First, the name of the country remained Dacheng, legally acknowledging the regime established by his younger brother, and the era name continued to be the 1st year of Kai Zheng, as introduced by Situ Lei.
Second, he renamed Jade Plate City to Jade Capital City.
Third, he harshly criticized Situ Lei for his crimes of patricide and treachery against his brother. Situ Yi claimed that his own previous act of raising an army was to punish the unrighteous, clean up the Situ Family, and set things right. His decision to allow the wild people to enter the passes was also for the purpose of borrowing their troops.
