List of former national capitals

Columns: Old capital city | Country | Today a part of | From | Until | Change , reason
Middag | Middag , Kingdom of | Taiwan | ? | 1732 ? | Middag annexed by Qing Dynasty | Tainan | Formosa , Republic of | Taiwan | 1895 | 1895 | Annexed by Japan | Tainan | Tungning , Kingdom of | Taiwan | 1662 | 1683 | Kingdom of Tungning conquered by Qing dynasty . Tainan remained the seat of government until 1885 | Asuka | Japan | Japan | ? | 694 | moved to Fujiwara-kyō ( Kashihara ) | Fujiwara-kyō ( Kashihara ) | Japan | Japan | 694 | 710 | moved to Heijō-kyō ( Nara ) | Heijō-kyō ( Nara ) | Japan | Japan | 710 | 784 | moved to Nagaoka-kyō ( Nagaoka )

Example questions:
What is the area of the city that was the former national capital of the Qin dynasty in East Asia from 221 BC to 206 BC ? | Which region is the city that was the former national capital of the Ming dynasty in East Asia from 1368 to 1421 situated ? | Which plain is the city that was the former national capital of the Han dynasty in East Asia from 206 BC to 25 on ? | Which rivers is the city that was the former national capital of the Han dynasty in East Asia from 25 to 220 on ?

Answers:
10,213 square kilometres | Yangtze River Delta | Guanzhong Plain | Luo River and Yellow River