Yang Zhao
In summer 606, Yang Zhao the Crown Prince became ill while visiting Luoyang, and soon died. Emperor Yang would not create another crown prince for the rest of his reign, creating Yang Zhao's sons Yang Tan (), Yang Tong, and Yang You imperial princes, while initially apparently tacitly considering his second son, Yang Jian the Prince of Qi (note different character than Emperor Wen) the de facto successor, leaving Yang Jian in charge of Luoyang whenever he would be away from Luoyang. Yang Su, whom Emperor Yang pretended to respect but actually feared, also died in summer 606.