It is a true allusion. His original surname was Liu and he was from the same clan as Liu Bang.

In December 8 AD, Wang Mang succeeded in usurping the throne and wanted to kill the descendants of the Liu royal family, so Liu Xiu led his followers to flee. The grassroots people surnamed Liu also fled for fear of being exterminated. One of the branches fled and ended up at Luotuo Bridge in Cixi. After settling down, he changed his surname to Zhou.

17 years later, Liu Xiu returned to Chang'an, regained the imperial power, and established the Eastern Han Dynasty to unify the world for 196 years.

In order to comfort their ancestors, the original Liu clan of Luotuoqiao made a rule: "Yin Liu Yang Zhou".

His surname was Zhou when he was alive. After his death, he recognized his ancestors and returned to his clan. In order to distinguish him, he changed the direction of the gate and called himself "Damen Zhou" from then on.