Yang Zhao
In 606, Yang Zhao died. According to Confucian principles of succession, Yang Dong's younger brother Yang You, also born in 605, would have been considered Yang Zhao's heir and successor, as Yang You was born of Yang Zhao's wife Crown Princess Wei. However, Emperor Yang did not create Yang You, Yang Dong, or their older brother Yang Tan (楊倓, born in 603) crown prince to replace Yang Zhao, but left the matters of succession ambiguous between them and Yang Zhao's younger brother Yang Jian the Prince of Qi. He did, however, create Yang Dong and his brothers imperial princes, and Yang Dong was created the Prince of Yue.