Trần Thánh Tông
In 1269, Trần Thánh Tông memorialized the Yuan court that the two Muslim merchants had died, so he would send two large elephants demanded by Huilonghaiya in the proper tribute year. In the next year, the Secretariat of the Yuan sent to the Vietnamese king a message, quoting the words from the "Spring and Autumn Annals" to chastise him for not "having kowtowed to the imperial edict; for having treated the emissary of the Son of Heaven (Kublai) improperly; for having presented bad-tasting medicine; and for having dishonest in the matter of the Muslim merchants." Trần Thánh Tông refused these accusations in his letter written in Classical Chinese to Kublai next year (1271). In the next two years, Kublai sent new overseers to Đại Việt, demanded for searching the lost copper columns of Ma Yuan which erected after the Trung sisters' rebellion was suppressed in 43 AD, and one again wanted Trần Thánh Tông to be presented in Dadu in person. He refused.