Emperor Ai of Tang
In 904, Zhu forced Emperor Zhaozong to move the capital from Chang'an to Luoyang, which was even more firmly under his control. Later that year, fearing that the adult Emperor Zhaozong would try to rise against him while he was away on campaigns against other warlords, he had Emperor Zhaozong assassinated. Bypassing Li Yu and the other older princes, he had an edict issued in Emperor Zhaozong's name creating Li Zuo crown prince and changing his name to Li Chu. Shortly after, Li Chu took the throne (as Emperor Ai). Empress He, who survived the assassination, was honored empress dowager.
Empress Dowager Wang (Rui)
Empress Dowager Wang (王太后, personal name unknown) (died 928) was a concubine of the late-Tang Dynasty warlord Yang Xingmi and the mother of his son Yang Pu, the final ruler and the only emperor of the Wu state founded upon the territory that Yang Xingmi took. During Yang Pu's reign as emperor, she was honored as empress dowager.