The couplet of the temple gate is: three people, three surnames and three sworn, one monarch, one minister and one saint. Some people say: According to legend, Liu Bei is the mercury that suppresses fire. The Sanyi Hall was built to echo the mountaineering building at the southern end of the fortress wall and balance water and fire.
However, judging from the fact that surnames such as Zhang, Tian, Liu, Meng and Wang can take root here when the fort was built, the biggest implication of building Sanyi Hall lies in the word "righteousness". What people pray for is that the chivalrous spirit of Liu, Guan and Zhang can be carried forward in Shangsuzhuang.
Extended data
Three people, three surnames and three brothers, one monarch, one minister and one saint.
This couplet is easy to understand. Couplets mean Liu Bei, Guan Yu and Zhang San, but three people have three surnames. Of course, Liu Bei became the emperor of Shu Han, and Zhang Fei was the minister who established Shu Han by Liu Bei. As for Guan Yu, he was a courtier of Liu Bei before his death. After his death, he was named a saint by emperors of various dynasties and recognized by ordinary people from generation to generation. This is the so-called "one monarch, one minister and one saint".
Baidu Encyclopedia-Shangsu Town