Trần Thánh Tông
Right after the marriage, Trần Thái Tông chose Lê Phụ Trần and Chu Bác Lãm as the Emperor's envoys to the Yuan Dynasty in 1258. In this voyage, Chief Ambassador Lê Phụ Trần was able to negotiate with the Yuan Dynasty for a 3-year period of paying tribute instead of the confused demand of tribute from the Yuan Dynasty before. After the coronation of Trần Thánh Tông in February 1258, Lê Phụ Trần was promoted to commander-in-chief of Đại Việt's navy (Thủy quân đại tướng quân) in June 1259 as a part of the Emperor's plan of reinforcing the Trần Dynasty by several recruitements and reorganization of the military division so that the operating and fighting ability of Đại Việt army could be improved.