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.
Trần Thị Dung
Mother of the Nation Lady Linh Từ (Vietnamese: Linh Từ Quốc mẫu, Hán tự: 靈慈國母) Trần Thị Dung (?–1259) was the last empress and the last empress mother of the Lý Dynasty. She was entitled by the Emperor Lý Huệ Tông as Empress Consort of the Lý Dynasty from 1216 to 1225 before becoming Empress Mother of the Lý Dynasty when her daughter Lý Phật Kim was enthroned as Lý Chiêu Hoàng in 1225. After Trần Thủ Độ, Trần Thị Dung's cousin, successfully overthrew the Lý Dynasty and founded the Trần Dynasty, Trần Thị Dung was downgraded to Princess Thiên Cực while her brother Trần Thừa's son became Trần Thái Tông, first emperor of the Trần Dynasty. Besides Lý Chiêu Hoàng, Trần Thị Dung had another daughter who eventually also became Empress of the Trần Dynasty, the Empress Thuận Thiên.