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Like Mongolia, Tibet was the center of a vast empire. Beginning in the seventh century, Tibetan armies moved north, east, and west from the area around the Yalu River in the region near present-day Lhasa. Within a few decades, they had conquered much of central Asia, including the important routes through Xinjiang used by China to trade with Western neighbors. In the eighth century the Tibetan Empire was the most feared political power in Asia. For a short period in 755, Tibetans even captured Chang'an, then the capital of China, chasing the Chinese emperor and his court from the city. Internal disputes eventually divided the Tibetan Empire, and the court's authority gave way to local leaders. However, there are lasting legacies of this imperial period. One is language. In modern China there are three dialect groups, all closely related to one another and descended from the language of the empire's armies. The first is Central Tibetan, spoken around Lhasa, in an area now called the Tibetan Autonomous Region (TAR). The second is Khams, spoken east of the TAR in Sichuan, Yunnan, and in some parts of Qinghai. The third dialect group is Amdo, spoken north of the TAR, in Qinghai, Sichuan, and Gansu provinces. Tibetan languages are also spoken in Nepal, Bhutan, and India. All of these linguistic varieties use the same written language, which is based on an alphabet invented in Tibet during the reign of Srong bstan Sgam po (627-650).