Yang Liang
Upon hearing Emperor Yang's ascension, Yang Liang, then the commandant at Bing Province (并州 roughly modern Taiyuan, Shanxi) and in control of the territory north of the Yellow River, rebelled—inexplicably declaring, as his reason for rebelling, that Yang Su had committed treason. Emperor Yang sent Yang Su to attack Yang Liang, and Yang Su, after capturing Yang Liang's general Xiao Mohe, forced Yang Liang's surrender. For Yang Su's contributions, Emperor Yang gave his sons Yang Wandan (楊萬石), Yang Renxing (楊仁行), and Yang Xuanting (楊玄挺) all mid-level imperial posts and much treasure, previously owned by Yang Liang.