This is the commemorative edition for the 4th International Conference on the Church of the East in China. This is a collection of essays used as background research to seek and find the lost churches of the Silk Road. The author has used the "Da Qin Jing Jiao" Stone to provide clues for searching for the reported churches and monasteries that we built during the Tang dynasty. For later periods material from Mogao and other artifacts have been used in the investigation.