King Mongkut (King Rama IV) of the Chakri Dynasty was the son of Pra Bhuddha Loetlar Naphalai (King Rama II) and Somdej Pra Srisuriyentramart. His Majesty King Rama IV was born on October 18, 1804. When His Majesty was young, He studied ancient Thai language and Royal Customs and Traditions. After shaving His tonsure, He became a novice in Buddhism. At the age of 21, He entered monkhood and remained a Buddhist monk for 27 years. While being a monk, He had studied Buddhism attentively, both in practice and in theory, some foreign languages, science, political science, western cultures and the world situation in the colonialism era. Moreover, He had been travelling all over the country to visit various ancient temples in many cities and had simultaneously learned more about the Thai people as well as the country. Once He mounted the throne as king, what He had learned and experienced became very in ruling the country in the unfavourable world situation at that time.