《旧唐书·本纪·卷十六》
五月二十八日，敕令原先氵殷州在郾城设置的治所应当废除；郾城的上蔡、西平、遂平三县重新隶属于蔡州。
癸亥，敕先置溵州于郾城，宜废；其郾城上蔡、西平、遂平两县复隶蔡州。
On the 28th of May, an imperial edict ordered the former seat of government of Yinzhou in Yancheng to be abolished and the three counties of Shangcai, Xiping, and Suiping of Yancheng to be placed under the jurisdiction of Caizhou again. 