 The death of the top Mongol leader, Sagatou, was the beginning of the end of the Mongol invasion of Champa and Annam.The mutual struggle against the Mongols brought Đại Việt and Champa closer together.Thus, the Đại Việt emperor Trần Nhân Tông married off his daughter, Huyen Tran, to Chế Mân in exchange for the provinces of O and Lý.