According to historical records, in A.D. 1 122 (in the sixth year of Tianfu and the fourth year of Xuanhe), the Khitan was conquered by Jin and Dundahaote Town was built. Because it used to be the nomadic land of Wuhuan people, it was called Zhou Huancheng.
This ancient city has long been abandoned. According to local chronicles, this ancient city was later called Assistant Lang City, but it has nothing to do with Yang Silang.
"Song history according to? According to the Biography of Yang Ye, Yang Ye had seven sons, namely, the eldest son Yan Yu (killed with Yang Ye in the Northern Expedition), Yan Lang (Yang,), Yan Xun and Yan Guihe. There is no such thing as "Yan Hui".
However, the story in the play is not completely in line with historical facts, but only expresses people's admiration and nostalgia for a loyal Yang Jiajiang.
Therefore, the details of "Shiro's visit to his mother" cannot be verified, not to mention the specific time when the story happened.
As a drama story, you only need to know that the story you told was in the early Northern Song Dynasty.