The Chinese phrase Four Great Ancient Capitals of China (中国四大古都 pinyin zhong1 guo2 si4 da4 gu3 du1) refers to Nanjing, Beijing, Xi'an, and Luoyang.
... 22.2% have children under the age of 18 living with them, 47.1% are married couples living together, 11.1% have a female householder with no husband present, and 38.1% ...