Ananda Mahidol
At the end of the World War II, the collaborationist leadership (including Marshal Plaek) was arrested and tried for war crimes, democratic elections for the entire People's Assembly were first held, and the young King Ananda Mahidol returned to Thailand for the first time in seven years. King Ananda Mahidol had just come of age, turning 20 in September 1945, and returned with his mother and Prince Bhumibol in December 1945.