李惠宗
Since new Vietnamese king Lý Huệ Tông had ascended the throne in 1206, there were no tributary missions from Vietnam to China until the Trần clan took the throne of Lý family in 1225. In 1229, new Vietnamese ruler Trần Thái Tông sent a diplomatic mission to Song China, and he was recognized as king of Annam. After the first Mongol invasion in 1258, Đại Việt ended all nominate tributary relation and diplomatic relations with the Song dynasty.