Triton XVIII

The name Kushan derives from the Chinese term Guishuang, used to describe one branch of the Yuezhi, a loose confederation of Indo-European people who had been living in the Xinjiang Province of modern China. Driven west by Xiongnu between 176 and 160 BC, the five groups of the Yuezhi – the Xiumi, Guishuang (Kushans), Shuangmi, Xidun, and Dumi – reached the Hellenic kingdom of Baktria by 135 BC. They expelled the ruling Greek dynasties there, forcing these kings further south to settle along the Indus River. In the following century, the Guishuang forced the other tribes of the Yuezhi into a tight confederation. Now, as the Guishuang was the predominant power, the entire group became known by that name. This appellation was Westernized as Kushan, though the Chinese still referred to them as Yuezhi.

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An adept military leader who expanded Kushan power throughout much of Central Asia, Vima Kadphises was the first Kushan ruler to send a diplomatic mission to Rome, during the reign of Trajan. Vima Kadphises was also the first Kushan ruler to strike gold coins. Because the Kushans under his reign had extended their protective control over the Silk Road, the Roman gold they obtained through the trading of luxury items with the Roman Empire–such as silk, spices, and other exotic goods–provided the metal for the striking of the first Indian gold coins. In addition to the existing copper and silver denominations, Vima Kadphises introduced three gold denominations: the dinar (struck on an 8g weight standard), the double dinar, and a fractional quarter dinar.

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