investitures (封 Peng'im: hong1 ) on Siamese monarchs as Siamlo Kok Ong (暹羅國王). Siamese kings did not consider themselves as submitted tributary rulers but rather as amicable gift exchangers, while the Chinese court would construe this as vassal homage from Siam. Entering the tributary relationship with China permitted the Siamese royal court to conduct lucrative commercial activities there. The Siamese court presented commodities ascribed by the imperial court as tributes to the Chinese Emperor who, in return, granted luxurious goods, which were more valuable than Siamese presented goods, in exchange. The Siamese mission to China was a profitable expenditure in itself in the view of Siamese royal court. The tributary relation with China did not have political implications in Siam as the Beijing court wielded little to no influence over Siam. Kings of the Chakri dynasty of the early Rattanakosin period continued the tradition of Chim Kong. The Siamese court of Bangkok was officially recognized and invested title by the Qing court in 1787. Siam sent tributes to China once every three years. The Chakri kings used the family name "Zheng" (鄭), which was the family name of King Taksin, in diplomatic letters to China. Chinese imperial court granted the Lokto Seal (駱駝 ) to the Siamese king in recognition. The jaded Lokto Seal bore Chinese letters Siamlo Kok Ong with the handle sculpted in the shape of camel. On each mission, the Siamese envoys presented three letters to the Chinese court; The royal letter to the Chinese Emperor inscribed on a golden plate The Khamhap (勘合 ) letter bearing the Lokto Seal and Siamese Royal Seal The letter from Phrakhlang the Minister of Trade with the Lotus Seal of Ministry of Trade and the Royal Seal The Lokto Seal served as confirmation of validity of the Siamese mission. Siamese envoys to China were hailed from the Kromma Tha Sai ( 'Department of the Left Pier') that dealt with Chinese affairs and were usually Chinese-speakers themselves. The mission consisted of three dignitaries; the First Envoy Rachathut, the Second Envoy Upathut, the Third Envoy Trithut and two translators; Thongsue and Pansue. The Siamese mission took maritime journey to Guangzhou, where Chinese officials verified the Lokto. The Siamese mission then proceeded by land to Beijing. By the 1830s, the Chinese junk trades declined. In 1839, Emperor Daoguang ordered Siam to send tributes once every four years instead of three years. The Treaty