Bactria
Daxia, Tukhara and Tokharistan

Daxia, Ta-Hsia, or Ta-Hia (Chinese: 大夏; pinyin: Dàxià) was the name given in antiquity by the Han Chinese to Tukhara or Tokhara: the central part of Bactria. The name "Daxia" appears in Chinese from the 3rd century BC to designate a little-known kingdom located somewhere west of China. This was possibly a consequence of the first contacts between China and the Greco-Bactrian Kingdom.

During the 2nd century BC, the Greco-Bactrians were conquered by nomadic Indo-European tribes from the north, beginning with the Sakas (160 BC). The Sakas were overthrown in turn by the Da Yuezhi ("Greater Yuezhi") during subsequent decades. The Yuezhi had conquered Bactria by the time of the visit of the Chinese envoy Zhang Qian (circa 127 BC), who had been sent by the Han emperor to investigate lands to the west of China. The first mention of these events in European literature appeared in the 1st century BC, when Strabo described how "the Asii, Pasiani, Tokhari, and Sakarauli" had taken part in the "destruction of the Greco-Bactrian kingdom". Ptolemy subsequently mentioned the central role of the Tokhari among other tribes in Bactria. As Tukhara or Tokhara it included areas that were later part of Surxondaryo Region in Uzbekistan, southern Tajikistan and northern Afghanistan. The Tokhari spoke a language known later as Bactrian – an Iranian language. (The Tokhari and their language should not be confused with the Tocharian people who lived in the Tarim Basin between the 3rd and 9th centuries AD, or the Tocharian languages that form another branch of Indo-European languages.)

The name Daxia was used in the Shiji ("Records of the Grand Historian") by Sima Qian. Based on the reports of Zhang Qian, the Shiji describe Daxia as an important urban civilization of about one million people, living in walled cities under small city kings or magistrates. Daxia was an affluent country with rich markets, trading in an incredible variety of objects, coming from as far as Southern China. By the time Zhang Qian visited, there was no longer a major king, and the Bactrians were under the suzerainty of the Yuezhi. Zhang Qian depicted a rather sophisticated but demoralised people who were afraid of war. Following these reports, the Chinese emperor Wu Di was informed of the level of sophistication of the urban civilizations of Ferghana, Bactria and Parthia, and became interested in developing commercial relationship with them:

The Son of Heaven on hearing all this reasoned thus: Dayuan and the possessions of Daxia and Anxi Parthia are large countries, full of rare things, with a population living in fixed abodes and given to occupations somewhat identical with those of the people of Han, but with weak armies, and placing great value on the rich produce of China.

These contacts immediately led to the dispatch of multiple embassies from the Chinese, which helped to develop trade along the Silk Roads.

Kujula Kadphises, the xihou (prince) of the Yuezhi, united the region in the early 1st century and laid the foundations for the powerful, but short-lived, Kushan Empire. In the 3rd century AD, Tukhara was under the rule of the Kushanshas (Indo-Sasanians).
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