In Bianjing in the second year of Shaosheng (1095), Prime Minister Zhang Dun held the list of the "Yuanyou Party Membership Monument" in his hand. There was a lot of noise in the court. Su Shi, Qin Guan and other Yuanyou Party members were demoted one after another and were exiled to the miasma of Lingnan.
Qin Yan, a frustrated imperial lecturer in the Imperial Academy, buried himself in piles of ancient books all day long, accompanied by inscriptions on gold and stone tablets. He spent three years compiling "Yu Gong Jiuzhou Zheng", trying to correct the errors in "Yu Gong" using the method of ancient textual research - but found that there were dozens of differences between the rare Song Dynasty "Yu Gong" cited in the book and the old manuscripts in his own collection!
