In 755 A.D., five years after the rise of the Abbasids, during the reign of Abu Jaffar, the 3rd Abbasid Caliph, a rebellion broke out in China the leader of which was a Turk named An Lu-shan. Emperor Hasuan Tsung was driven from his capital and he abdicated in favour of his son Su Tsung (756-763 A.D.) who appealed to the Arabs for help. Abu Jaffar sent 4,000 Muslim soldiers who recovered Sian and Honanfu for the Emperor in 757 A.D.
These soldiers never went back, but instead married in China and formed the nucleus of the naturalised Chinese Muslims in Western China whose descendents live there even today. The story was repeated by Tai Tsung (763-780 A.D.), son of Su Tsung, who also sought help from Abu Jaffar when 300,000 Tibetans invaded his kingdom. Abu Jaffar sent a large contingent so much so that the Chinese government was obliged to double the tax on tea to raise funds to pay them. These Muslims also settled down in Western China and some in Yunnan, in South China, where they came to be known as Panthays.
As a result of contact with Muslim armies, many people accepted Islam, among them a tribe ralled Hui Chi, after whom the Muslims of China were known until the time of the Yuan (Mongol) dynasty, when the name was changed to Hui-Hui, by which name they are still known. But there is another name, which is generally used by Muslims, that is, Ching Zhen, In Chinese, Islam is called Ching Zhen Jiao, meaning Pure Religion, as Ching and Zhen mean clean and real respectively.