丁部領
In 972 Đinh Bộ Lĩnh sent tribute envoys include cloth, rhinoceros horns, elephant tusks and perfumed tea to the Song dynasty of China. The Song responded by sent an embassy to Dai Viet and beared the title "King of Jiaozhi Prefecture" for Bộ Lĩnh and that title was given for Vietnamese monarchs by the Song emperors until 1174.