Bianliang

Kaifeng () is a prefecture-level city in east-central Henan province, China. It is one of the Eight Ancient Capitals of China, having been the capital eight times in history, and is best known for having been the Chinese capital during the Northern Song dynasty.

As of 31 December 2018, around 4,465,000 people lived in Kaifeng's Prefecture, of whom 1,652,000 lived in the built-up (or metro) area made of Xiangfu, Longting, Shunhe Hui, Gulou and Yuwantai Districts. Located along the Yellow River's southern bank, it borders the provincial capital of Zhengzhou to the west, Xinxiang to the northwest, Shangqiu to the east, Zhoukou to the southeast, Xuchang to the southwest, and Heze of Shandong to the northeast.

Kaifeng is also a major city in the world by scientific research outputs as tracked by the Nature Index. The city is home to a campus of Henan University, one of the national key universities in the Double First Class University Plan.

Names

The postal romanization for the city is "Kaifeng". Its official one-character abbreviation in Chinese is (''Biàn''). Historically it has also been known as:
*''Dàliáng'' ()
*''Biànliáng'' ()
*''Biànzhōu'' ()
*''Nánjīng'' () (This is Jurchen Jin's terminology only and not to be confused with Nánjīng.)
*''Dōngjīng'' ()
*''Biànjīng'' ()

The area was named "Kaifeng" after the Qin's conquest of China in the second century BC. The name literally means "opening the border" and figuratively "hidden" and "vengeance". Its name was originally Qifeng (), but the syllable ''qi'' (Baxter-Sagart: /*kʰˤijʔ/) was changed to the essentially synonymous ''kai'' (/*Nə- �ˤəj/, /* �ˤəj/) to avoid the naming taboo of Liu Qi (Emperor Jing of Han).

Administration

The prefecture-level city of Kaifeng administers five districts and four counties:
* Gulou District ()
*Longting District ()
*Yuwangtai District ()
*Xiangfu District ()
*Shunhe Hui District ()
*Weishi County ()
* Qi County ()
*Tongxu County ()
*Lankao County ()

History

Kaifeng is one of the Eight Ancient Capitals of China. As with Beijing, there have been many reconstructions during its history.

In 364 BC during the Warring States period, the State of Wei founded a city called Daliang () as its capital in this area. During this period, the first of many canals in the area was constructed linking a local river to the Yellow River. When the State of Qin conquered the State of Wei, Kaifeng was destroyed and abandoned except for a mid-sized market town, which remained in place.

During the Han Dynasty, the city underwent some reconstruction. Kaifeng became the capital of Liu Wu (son of Han emperor Wen) when he was given the title of ''Liang Xiao Wang''. Liu Wu restored and constructed many buildings and old city walls. Kaifeng became a center of music, art, a refuge for artists, and of splendid gardens despite the trivial political importance of the city at this period.

Early in the 7th century, Kaifeng was transformed into a major commercial hub when it was connected to the Grand Canal as well as through the construction of a canal running to western Shandong.

In 781 during the Tang dynasty, a new city was reconstructed and named Bian (). Bian was the capital of the Later Jin (936–946), Later Han (947–950), and Later Zhou (951–960) of the Five Dynasties and Ten Kingdoms period. The Song dynasty made Bian its capital when it overthrew the Later Zhou in 960. Shortly afterwards, the city underwent further expansion.

During the Song, when it was known as Dongjing or Bianjing, Kaifeng, then the largest and most prosperous city in China, was the capital, with a population of over 400,000 living both inside and outside the city wall. Typhus was an acute problem in the city. The historian Jacques Gernet provides a lively picture of life in this period in his ''Daily Life in China on the Eve of the Mongol Invasion, 1250-1276,'' which often draws on ''Dongjing Meng Hua Lu'', a nostalgic memoir of the city of Kaifeng.

In 1049, the Youguosi Pagoda () – or Iron Pagoda as it is called today – was constructed measuring in height. It has survived the vicissitudes of war and floods to become the oldest landmark in this ancient city. Another Song-dynasty pagoda, , dating from 974, has been partially destroyed.

Another well-known sight was the astronomical clock tower of the engineer, scientist, and statesman Su Song (1020–1101 AD). It was crowned with a rotating armillary sphere that was hydraulically-powered (i.e. by water wheel and a water clock), yet it incorporated an escapement mechanism two hundred years before they were found in the clockworks of Europe and featured the first known endless power-transmitting chain drive.

Kaifeng reached its peak importance in the 11th century as a commercial and industrial center at the intersection of four major canals. During this time, the city was surrounded by three rings of city walls and probably had a population of between 600,000 and 700,000. It is believed that Kaifeng was the largest city in the world from 1013 to 1127.

This period ended in 1127 when the city fell to Jurchen invaders during the Jingkang Incident. It subsequently came under the rule of the Jurchen Jin dynasty, which had conquered most of North China during the Jin–Song Wars. While it remained an important administrative center, only the area inside the inner city wall of the early Song remained settled and the two outer rings were abandoned.

As the imperial capital of the Song, Kaifeng was conveniently situated along the Grand Canal for logistics supply but militarily vulnerable due to its position on the floodplains of the Yellow River.

Kaifeng served as the Jurchen "southern capital" from 1157 (other sources say 1161) and was reconstructed during this time.