《资治通鉴·后周纪·后周纪三》
戊戌，后周征发开封府、曹州、滑州、郑州的百姓十多万建筑大梁外城。
戊戌，发开封府、曹、滑、郑州之民十馀万筑大梁外城。
On wuxu, the Later Zhou Dynasty conscripted more than 100,000 people from Kaifeng Prefecture, Caozhou, Huazhou, and Zhengzhou to build the outer city of Daliang.