sentences:  In summer 619, he sent the officials Duan Da (段達) and Yun Dingxing (雲定興) to force Yang Tong to yield the throne to him.At that time, Yang Tong was in the presence of Empress Dowager Liu, and he shed tears before her, but eventually did yield the throne to Wang, who took the throne and established a new state of Zheng.As Wang created him the Duke of Lu, presumably she thereafter carried the title of Duchess Dowager of Lu.