 Complete the following phrase:  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, this situation in royal family made grand chancellor Trần Thủ Độ worried because he had profited the same circumstance of the Emperor Lý Huệ Tông to overthrow the Lý Dynasty. Therefore, in 1236 Trần Thủ Độ decided to force Trần Liễu to give up his wife Princess Thuận Thiên for the Emperor when she had been already pregt 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 pregt wife, Trần Liễu rose a revolt against the royal family, meanwhile 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, Trần Thủ Độ even wanted to behead Trần Liễu but was stopped by Thái Tông. After this chaotic event, Trần Thị Dung was praised for her important role in the reconciliation between Trần Thái Tông and his brother Trần Liễu. During the first 