 After the collapse of the Lý Dynasty, Trần Thủ Độ was afraid that the newly established Trần Dynasty might be dislodged by its political opponents; therefore he continued ruthlessly to eliminate members of Lý royal family.On the eighth day of the tenth lunar month (October 30) 1226, he forced the former emperor Lý Huệ Tông, who had already abdicated his power, to commit suicide.Trần Thủ Độ married Huệ Tông's former empress, Princess Thiên Cực Trần Thị Dung, who was also Trần Thủ Độ's cousin.