Sima Ying
In the midst of the War of the Eight Princes, in 304, Xiongnu nobles, led by the commander of the North Tribe, Liu Xuan (劉宣), tired of the Jin misrule and secretly plotted reindependence from Jin. They sent a messenger to secretly offer Liu Yuan the title of Grand Chanyu. Liu Yuan then told Sima Ying, who was then concerned about an attack from Wang Jun (王浚), whose troops were reinforced with Xianbei and Wuhuan soldiers, that he would be willing to mobilize Xiongnu soldiers to support Sima Ying's cause. Sima Ying agreed and allowed Liu Yuan to return to the Xiongnu tribes.