Bhumibol Adulyadej; born 5 December 1927 is the reigning King of Thailand. He is known as Rama IX. Having reigned since 9 June 1946, he is the world's longest-serving current head of state and the longest-reigning monarch in Thai history.
Bhumibol was crowned King of Thailand on 5 May 1950 at the Royal Palace in Bangkok where he pledged that he would "reign with righteousness for the benefit and happiness of the Siamese people" ("เราจะครองแผ่นดินโดยธรรม เพื่อประโยชน์สุขแห่งมหาชนชาวสยาม"). Notable elements associated with the coronation included the Bahadrabith Throne beneath the Great White Umbrella of State; and he was presented with the royal regalia and utensils.