Tang Dynasty KaiyuanHongnong函谷关in the ancient couny received a Bao FuIs a white stoneA word written in redIs a "to" wordThose who understand the word and interpret the word, said: "This' to 'word is the meaning of 48Is used to indicate when those saints in the history of the emperor to how many years"By the second year of the emperor to SichuanExactly四十八年Po has been at the timeThe world's people are singing, said: "Ye DepotYe Hongnong; Hongnong YeJerusalem DepotDepot site of that yearKaiyuan reign title had changed to a Tianbao years"