King Bhumibol Adulyadej was not destined to become the King of Thailand. After King Prajadhipok abdicated in 1935 a decision was made to ascend Bhomibol’s brother Ananda to the throne. Ananda was assassinated in June 1946. Bhumibol studying engineering in Switzerland then changed to political science and would ascent the throne in 1950.
In my opinion based on talks with my Thai friends. Even though he was the King, they feel he was down to Earth and frugal in his ways. He was raised like a normal child without the trappings of monarchy, did his chores, attended school (in Switzerland) without any special privilege. He then devoted his life to enhancing the quality of life of his subjects.