Trần Thủ Độ
According to "Đại Việt sử kí toàn thư", Thái Tông and his wife, the Empress Chiêu Thánh, did not have their first son for a while, so this situation in the royal family made grand chancellor Trần Thủ Độ worried because he had profited in the same circumstances of the Emperor Lý Huệ Tông to overthrow the Lý Dynasty. Therefore, in 1237 Trần Thủ Độ decided to force Trần Liễu to give up his wife Princess Thuận Thiên for the Emperor when she had been already pregnant with Trần Quốc Khang for three months. After the royal marriage, Thuận Thiên was entitled the new empress of the Trần Dynasty while Chiêu Thánh was downgraded to princess. In the fury of losing his pregnant wife, Trần Liễu rose in revolt against the royal family.Emperor Thái Tông felt awkward about the situation and decided to become a monk in Yên Tử Mountain. Finally Trần Thủ Độ successfully persuaded Thái Tông to return to the throne and Trần Liễu had to surrender after judging that he could not stand with his fragile force. All soldiers who participated in this revolt were killed, and Trần Thủ Độ even wanted to behead Trần Liễu but was stopped by Emperor Thái Tông. Vietnamese historians in dynastic era such as Ngô Sĩ Liên or Phan Phu Tiên often criticized decisions of Trần Thủ Độ and Trần Thái Tông in this event and considered it as origin for the downfall of the Trần Dynasty afterwards during the reign of Trần Dụ Tông.