Soon after their arrival Dr. House and Mr. Mattoon were taken by their fellow missionaries to call upon two princes who had manifested a friendly interest in the westerners. The acquaintance thus formed proved to be of large influence both to the mission and to the Siamese nation. One of these princes was entitled Chao Fah Yai, which signifies “The older brother of the king,” while his brother was entitled Chao Fah Noi, meaning “The younger brother of the king.” As Chao Fah Yai later became King of Siam and his brother the Vice-King at the same time and as this new king played a momentous part in the opening of Siam to intercourse with the western nations as well as showed much favour to the mission work, it is essential to give a sketch of that important personage. When, in 1824, the throne was made vacant by the death of the royal father of these two men, the older son had expected to succeed to the throne. Apparently this had been the father’s intention, for he had given this son the name “Mongkut,” meaning “crown prince.” Through intrigue, however, the crown went to a half-brother who, under the title Phra Chao Pravat Thong, was the reigning king when Dr. House reached Siam. Chao Fah Yai, having been thwarted in his aspirations towards the throne, entered the priesthood and retired to a watt, doubtless as the safest way to avoid the royal displeasure towards a rival,—a course which the custom of the country made possible for him. The princely rank of this priest made him the leader of the Buddhist religion in Siam; and his great wealth enabled him to make his watt one of the most notable and influential in the country. He was a man of enlightened mind beyond his generation. In marked contrast to the king, he was interested in foreign affairs and amicably disposed towards the few foreigners living in Bangkok, especially towards the missionaries, because of their education and culture.