The Chinese historical annals talk about a steppe nomadic people further west known as the Wu Sun who historians claim are the Yuèzhi of Roman historical sources.
The Wu Sun people are recorded in Chinese sources of the Later Han dynasty (25–220 CE), and were settled along the Ili river, which flows from the Tien Shan mountain range. They were a confederation of nomadic tribes who spoke Turkic languages, and were known to the Han Chinese as the Wu Sun, a name which can be translated as "Powerful People".
The Wu Sun people made incursions into Han China during the Later Han period, and were eventually defeated by the armies of the Han dynasty, who occupied the area around the Ili river. The Wu Sun people continued to exist as a distinct group, however, and some of them migrated further westwards, into the area around the Aral Sea
where they came into contact with the Yuèzhi, a people who had migrated westwards from the area around the Gansu corridor.The Wu Sun people and the Yuèzhi had a number of similarities, such as their nomadic lifestyle and their use of horses in warfare
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