Prince of Chu
In fall 618, after Li Mi was defeated by Wang and submitted to Li Yuan (who established Tang Dynasty after hearing of Emperor Yang's death earlier that year, at the hands of Yuwen Huaji), Zhu sent messengers to nominally submit to Emperor Yang's grandson Yang Tong, who had been declared emperor at Luoyang but who by this point was under Wang's control. Yang Tong created Zhu the Prince of Chu.