1927 - Born on the 5th of December at Mount Auburn Hospital in Cambridge, Massachusetts in the United States.
1933 - After primary schooling at the Mater Dei school in Bangkok, he left with the rest of his family in for Switzerland, where he continued his secondary education at the École Nouvelle de la Suisse romande in Chailly-sur-Lausanne, and received the baccalauréat de lettres (high-school diploma with major in French literature, Latin, and Greek) from the Gymnase classique cantonal of Lausanne.
1938-1945 - Stayed in Switwerland to continue his studies.
1946-1951 - Ruled under regency .Bhumibol was crowned King of Thailand on May 5, 1950.
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