Source Data Reference for:

City = Kaifeng
Time = -500

City Year Size Size Comment Year Comment Author Title Location
Daliang-400 100,000George ModelskiWorld Cities -3000 to 2000p42
Kaifeng-364foundedn/ahttp://en.wikipedia.org/wiki/List_of_cities_by_time_of_continuous_habitationeng2013
Daliang-300 200,000George ModelskiWorld Cities -3000 to 2000p42