Vietnam's only reigning empress was made to hand the throne to her child husband in 1225, and the chronicle says the Lý clan was buried alive in 1232

The Đại Việt sử ký toàn thư records that in 1224 the sick emperor Lý Huệ Tông, pressed by the palace guard commander Trần Thủ Độ, gave the throne to his daughter Chiêu Thánh, then six. She reigned as Lý Chiêu Hoàng, Vietnam's only reigning empress. In 1225 Thủ Độ married her to his nephew Trần Cảnh, a boy her own age, and she abdicated to him. The chronicle says Thủ Độ once found the retired emperor pulling weeds at his temple and told him, "Pull them out by the deep roots." In the eighth month of 1226 Thủ Độ sent men to him, and he took his own life; the chronicle calls it regicide. In 1232 the court renamed the fallen dynasty "Nguyễn" to end the people's hope in the Lý. That winter, the chronicle says, Thủ Độ dug a pit under a hall where the Lý kin gathered to worship and buried them alive. The chronicle's own note doubts the massacre, because an earlier historian did not record it. In 1237 Chiêu Thánh, childless, was demoted so her husband could take her elder sister, pregnant and married to his brother, as empress. The Hwasan Lee clan of Korea says a Lý prince, Lý Long Tường, fled by sea in 1226 and founded it. In 1995 its representatives visited Vietnam and were received by the Communist Party general secretary. Chiêu Thánh remarried in 1258 and died in 1278. Her statue stands in Đền Rồng temple, Bắc Ninh.