《北齐书·列传·卷二十一》
此时初次招募勇士，都督孛八、高法雄、封子元等不愿意远地戍守，遂聚众为乱。
时初召募勇果，都督孛八、高法雄、封子元等不愿远戍，聚众为乱。
At that time, the authorities began to recruit young warriors for military service. Military supervisors Bo Ba, Gao Faxiong, Feng Ziyuan, and others were reluctant to Garrison far from home, and they thus rallied the common people to create chaos.