Yang Liang
In 604, Yang Guang became emperor (as Emperor Yang) after Emperor Wen's death. (Most traditional historians believe that Emperor Wen was murdered at Yang Guang's order, although they admit a lack of direct evidence.) Emperor Yang, apprehensive of Yang Liang's intentions, did not initially announce Emperor Wen's death, and sent the general Qutu Tong () to Taiyuan to, using an edict in Emperor Wen's name, summon Yang Liang to the capital Daxing. However, Yang Liang figured out the edict to be a forgery, and declared a rebellion, supported by governors of 19 provinces. However, even though Wang Kui pointed out to him that he needed to make a quick election between the strategies of attacking Daxing quickly (in which case he needed to advance as fast as he could) or to try to hold his territory north of the Yellow River (in which case he needed to make certain that the generals in charge of his operations were largely people from the old territory of Northern Qi), Yang Liang could not decide which set of strategies to use, and therefore used a mixed approach. As his rationale for rebelling, he declared that Yang Su had committed treason. (As the modern historian Bo Yang pointed out, falsely accusing Yang Su of treason was an unconvincing declaration. Bo suggested that even if Yang Liang had not known about Yang Guang's involvement in Emperor Wen's death by that point, he still nevertheless should have accused Yang Guang of patricide.)