When did the Liu family in Wang Jun ditch in Shangnan move from Anhui? What does the plaque in the front hall of Liu Ancestral Hall "Chenopodium Light Room" mean? ...

This is a 250-year history of immigration. During the Qianlong period of the Qing Dynasty and for a long time afterwards, a large number of Anqing people left their homes and moved to Shangzhou, Luonan, Feng Dan, Shangnan, Yang Shan, Zhen 'an and other counties in Shangluo, Shaanxi Province, Yunxi County in Hubei Province, Xichuan and Xixia County in Henan Province, which was more than 0/000 kilometers away from Anqing/KLOC. This history is little known now, and even left many mysteries.

Chenopodium originally refers to the scene where scholars study hard under the lamp at night, which means scholarly family.

The third question is unclear and cannot be answered.