They succeeded in separating the Xiongnu from the Qiang peoples to the south, and also gained direct access to the Western Regions. Because of strong Han control over the Xiongnu, the Xiongnu became unstable and were no longer a threat to the Han Empire. Ban Chao, Protector General (都護; Duhu) of the Han dynasty, embarked with an army of 70,000 soldiers in a campaign against the Xiongnu remnants who were harassing the trade route now known as the Silk Road. His successful military campaign saw the subjugation of one Xiongnu tribe after another. Ban Chao also sent an envoy named Gan Ying to Daqin (Rome). Ban Chao was created the Marquess of Dingyuan (定遠侯, i.e., "the Marquess who stabilized faraway places") for his services to the Han Empire and returned to the capital Luoyang at the age of 70 years and died there in the year 102. Following his death, the power of the Xiongnu in the Western Regions increased again, and the emperors of subsequent dynasties did not reach as far west until the Tang dynasty. Xiongnu Civil War (60–53 BC) When a Chanyu died, power could pass to his younger brother if his son was not of age. This system, which can be compared to Gaelic tanistry, normally kept an adult male on the throne, but could cause trouble in later generations when there were several lineages that might claim the throne. When the 12th Chanyu died in 60 BC, power was taken by Woyanqudi, a grandson of the 12th Chanyu's cousin. Being something of a usurper, he tried to put his own men in power, which only increased the number of his enemies. The 12th Chanyu's son fled east and, in 58 BC, revolted. Few would support Woyanqudi and he was driven to suicide, leaving the rebel son, Huhanye, as the 14th Chanyu. The Woyanqudi faction then set up his brother, Tuqi, as Chanyu (58 BC). In 57 BC three more men declared themselves Chanyu. Two dropped their claims in favor of the third who was defeated by Tuqi in that year and surrendered to Huhanye the following year. In 56 BC Tuqi was defeated by Huhanye and committed suicide, but two more claimants appeared: Runzhen and Huhanye's elder brother Zhizhi Chanyu. Runzhen was killed by Zhizhi in 54 BC, leaving only Zhizhi and Huhanye. Zhizhi grew in power, and, in 53 BC, Huhanye moved south and