Siam resolved to move Tuan Besar to somewhere else to placate the conflicts. Eventually, Tuan Besar was made the ruler of Pattani in 1842, becoming Sultan Phaya Long Muhammad of Pattani. Descendants of Phaya Long Muhammad would continue to rule Pattani until 1902. After the First Opium War, British Empire emerged as the most powerful maritime power in the region and was eager for more favorable trade agreements. By 1840s, Siam had re-imposed trade tariffs through Chinese tax collector system. Both the British and the Americans sent their delegates (Brooke and Balestier) to Bangkok in 1850 to propose treaty amendments but were strongly rejected. Only with the Bowring Treaty of 1855 that these goals were achieved, liberalizing Siamese economy and ushering new period of Thai history. King Rama III reportedly said on his deathbed in 1851: "...there will be no more wars with Vietnam and Burma. We will have them only with the West.". King Mongkut, who had been a Buddhist monk for twenty-seven years, ascended the throne in 1851 with supports from Bunnag family. King Mongkut made his younger brother Pinklao the Vice-King or Second King of the Front Palace. Mongkut also granted the exceptionally high rank of Somdet Chaophraya to the Bunnag brothers – Chaophraya Phrakhlang (Dit Bunnag) and Phraya Siphiphat (That Bunnag), who became Somdet Chaophraya Prayurawong and Somdet Chaophraya Phichaiyat, respectively, cementing the roles and powers of Bunnag family in Siamese foreign affairs in mid-nineteenth century. Chuang Bunnag, Prayurawong's son, also became Chaophraya Si Suriyawong. Early Modern Siam (1855–1905) Bowring Treaty and consequences King Mongkut and Chaophraya Si Suriyawong (Chuang Bunnag) realized that, due to geopolitical situation, Siam could stand no more against British demands for concessions. Sir John Bowring the Governor of Hong Kong, who was the representative of British government in London rather than East India Company, arrived at Bangkok in 1855. The Bowring Treaty was signed in April 1855, in which tariff was reduced and standardized to three percent and the Phasi Pak Ruea or measurement duties was abolished. The treaty granted extraterritoriality to the British in Siam, who would subject to British consular authority and British law instead of traditional Siamese inquisition, as Westerners sought to dissociate themselves from Siamese Nakhonban methods of judiciary tortures. The treaty also stipulated establishment of British consulate in Bangkok. The Bowring Treaty was followed by similar 'unequal treaties' with other Western nations including the United States