集神州三寶感通錄 2.54

2.54

50. In the middle of the Longshuo era of the Tang, when there were military operations in Liaozuo, the marching general Xue Rengui traveled to the ancient territory where the Sui sovereign had campaigned against Liao. There he saw a mountain image in an expansive, desolate wilderness cut off from travelers. Inquiring of the elders, they said it was manifested in a former era. He thereupon had a copy drawn and transmitted back to the capital.